How To Read The Periodic Table: 14 Steps (with Pictures) - WikiHow

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Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow How to Read the Periodic Table PDF download Download Article Explore this Article parts Sample Periodic Table 1 Recognizing the Structure of the Periodic Table 2 Studying the Elements 3 Using the Atomic Weight to Calculate Neutrons + Show 1 more... - Show less... Other Sections Expert Q&A VideoWATCH NOW Tips and Warnings Related Articles References Article Summary Co-authored by Ronitte Libedinsky, MS and Danielle Blinka, MA, MPA

Last Updated: November 18, 2025 Fact Checked

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This article was co-authored by Ronitte Libedinsky, MS and by wikiHow staff writer, Danielle Blinka, MA, MPA. Ronitte Libedinsky is an Academic Tutor and the Founder of Brighter Minds SF, a San Francisco, California based company that provides one-on-one and small group tutoring. Specializing in tutoring mathematics (pre-algebra, algebra I/II, geometry, pre-calculus, calculus) and science (chemistry, biology), Ronitte has over 10 years of experience tutoring to middle school, high school, and college students. She also tutors in SSAT, Terra Nova, HSPT, SAT, and ACT test prep. Ronitte holds a BS in Chemistry from the University of California, Berkeley, and an MS in Chemistry from Tel Aviv University. There are 8 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 658,200 times.

If you find the periodic table confusing and difficult to understand, you aren’t alone! Understanding how it works can be hard, but learning how to read it will help you be successful in the sciences. Start by recognizing the structure of the periodic table and what this tells you about each element. Next, you can study each element. Finally, use the information provided on the periodic table to find the number of neutrons in an atom.

Steps

Sample Periodic Table

Sample Periodic Table Part 1 Part 1 of 3:

Recognizing the Structure of the Periodic Table

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  1. Illustration of the periodic table of elements. 1 Read the periodic table from top left to bottom right. The elements are ordered by their atomic numbers, which increase as you move across and down the periodic table. The atomic number is how many protons the element’s atom possesses. You’ll also notice that each element’s atomic mass increases as you move across the table. This means you can recognize a lot about an element’s weight by just looking at its place on the table.[1]
    • The atomic mass increases as you move across or down the table because the mass is calculated by adding up the protons and neutrons in each element’s atom. The number of protons increases with each element, which means the weight goes up, as well.
    • Electrons are not included in the atomic mass, as they contribute much less to the atom’s weight than protons and neutrons.
  2. Step 2 Observe that each element contains 1 more proton than its predecessor. 2 Observe that each element contains 1 more proton than its predecessor. You can tell this by looking at the atomic number. Atomic numbers are ordered from left to right. Since the elements are also arranged by group, you will see gaps on the table.[2]
    • For example, the first row contains Hydrogen, which has an atomic number of 1, and Helium, which has an atomic number of 2. However, they are at opposite ends of the table, as they are in different groups.
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  3. Step 3 Recognize groups, which share physical and chemical properties. 3 Recognize groups, which share physical and chemical properties. Groups, also known as families, fall in a vertical column. In most cases, groups will share the same color, as well. This helps you identify which elements have similar physical and chemical properties to each other, which allows you to predict how they’ll behave.[3] Each element in a particular group has the same number of electrons in its outer orbital.[4]
    • Most elements fall into 1 group, but Hydrogen can be placed with the Halogen family or the Alkali Metals. On some charts, it will appear with both.
    • In most cases, the columns will be numbered 1-18, either above or below the table. The numbers may be shown in Roman numerals (IA), Arabic numerals (1A), or numerals (1).
    • When you go down a group from top to bottom, it’s called “reading down a group.”
  4. Step 4 Notice why gaps exist in the table. 4 Notice why gaps exist in the table. Although elements are ordered based on their atomic number, they’re also arranged into groups and families that share the same physical and chemical properties. This helps you better understand how each element behaves. Since elements don’t always fall neatly into groupings as they increase in number, the periodic table contains gaps.[5]
    • For example, the first 3 rows have gaps, as the Transition Metals don’t appear on the table until atomic number 21.
    • Similarly, elements 57 through 71, which are the Rare Earth Elements, are usually pictured as a subset at the bottom right of the table.
  5. Step 5 Notice that each row is called a period. 5 Notice that each row is called a period. All of the elements in a period have the same number of atomic orbitals, which is where their electrons go. The number of orbitals will match the number of the period. There are 7 rows, meaning that there are 7 periods.[6]
    • For example, the elements in the period 1 have 1 orbital, while the elements in period 7 have 7 orbitals.
    • In most cases, they’re numbered 1-7 down the left hand side of the table.
    • When you move across a row from left to right, it’s called “reading across a period.”
  6. Step 6 Distinguish between metals, semi-metals, and non-metals. 6 Distinguish between metals, semi-metals, and non-metals. You can better understand the properties of an element by recognizing what type of element it is. Fortunately, most periodic tables use color to indicate whether the element is a metal, semi-metal, or non-metal. You’ll notice that metals occur to the left of the table, while non-metals fall on the right. Semi-metals are sandwiched between them.[7]
    • Keep in mind that hydrogen can be grouped with either the Halogens or the Alkali Metals because of its properties, so it may appear on either side of the table or may be colored differently.
    • Elements are labeled as a metal if they have luster, are solid at room temperature, conduct heat and electricity, and are malleable and ductile.
    • Elements are considered a non-metal if they lack luster, don’t conduct heat or electricity, and are non-malleable. These elements are usually gases at room temperature but may also become a solid or liquid at certain temperatures.
    • Elements are labeled as semi-metals if they have a mixture of properties of both metals and non-metals.[8]
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Part 2 Part 2 of 3:

Studying the Elements

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  1. Step 1 Recognize the element’s 1 to 2-letter symbol. 1 Recognize the element’s 1 to 2-letter symbol. It most often appears in the center of the box in a large font. The symbol abbreviates the element's name, which is standardized across different languages. When you're doing experiments or working with elemental equations, you'll likely use the elements' symbols, so it's important to familiarize yourself with them.[9]
    • This symbol is usually derived from the Latin form of the element’s name, but it may be derived from the widely accepted common name, especially for newer elements. For example, the symbol for Helium is He, which closely resembles the common name. However, the symbol for Iron is Fe, which is harder to recognize at first.
  2. Step 2 Look for the full name of the element, if it’s present. 2 Look for the full name of the element, if it’s present. This is the name of the element that you will use when writing it out. For example, “Helium” and “Carbon” are the names of elements. In most cases, this will appear just below the symbol, but its placement can vary.[10]
    • Some periodic tables may omit the full name, using just the symbol.
  3. Step 3 Find the atomic number. 3 Find the atomic number. The atomic number is often located at the top of the box, either in the center or the corner. However, it could be located under the element symbol or name. Atomic numbers run sequentially from 1-118.[11]
    • The atomic number will be a whole number, not a decimal.
  4. Step 4 Recognize the atomic number is the number of protons in an atom. 4 Recognize the atomic number is the number of protons in an atom. All of an element’s atoms contain the same number of protons. Unlike with electrons, an atom cannot gain or lose protons. Otherwise, the element would change![12]
    • You’ll use the atomic number to find the number of electrons and neutrons as well!
  5. Step 5 Know elements contain the same number of electrons as protons. 5 Know elements contain the same number of electrons as protons. There is an exception if they're ionized. Protons have a positive charge, and electrons have a negative charge. Since regular atoms don’t have an electrical charge, that means electrons and protons are equal. However, an atom can lose or gain electrons, which makes it ionized.[13]
    • Ions are electrically charged. If an ion has more protons, it is positive, which is indicated with a positive sign next to the ion’s symbol. If it has more electrons, the ion is negative, which is indicated with a negative symbol.
    • You will not see a plus or minus symbol if the element is not an ion.
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Part 3 Part 3 of 3:

Using the Atomic Weight to Calculate Neutrons

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  1. Step 1 Find the atomic weight. 1 Find the atomic weight. The atomic weight usually appears at the bottom of the box, below the element symbol. The atomic weight represents the combined weight of the particles in the nucleus, which includes protons and neutrons. However, isotopes complicate the calculation, so the atomic weight represents an average of the atomic mass of the element and the atomic mass of its isotopes.[14]
    • Because the weights are averaged, most elements will have atomic weights that include decimals.
    • Although it may appear as though the atomic weight increases in number from top left to bottom right, this is not true in all cases.
  2. 2 Determine the mass number of the element you’re studying. You can find the mass number by rounding the atomic mass to the nearest whole number. This accounts for the fact that the atomic weight is an average of all possible atomic masses for that element, including isotopes.[15]
    • For example, the atomic weight of Carbon is 12.011, which rounds to 12. Similarly, the weight of Iron is 55.847, which rounds to 56.
  3. Step 3 Subtract the atomic number from the mass number to find the neutrons. 3 Subtract the atomic number from the mass number to find the neutrons. The mass number is calculated by adding together the number of protons and neutrons. This allows you to easily find the number of neutrons in an atom by subtracting the number or protons from the mass number![16]
    • Use this formula: Neutrons = Mass Number - Protons
    • For example, Carbon’s mass number is 12, and it has 6 protons. Since 12 - 6 = 6, you know Carbon has 6 neutrons.
    • For another example, Iron’s mass number is 56, and it has 26 protons. Since 56 - 26 = 30, you know Iron has 30 neutrons.
    • An atom’s isotopes will contain a different number of neutrons, which changes the atom’s weight.
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Expert Q&A

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  • Question How do I find the number of protons? Bess Ruff, MA Bess Ruff, MA Environmental Scientist Bess Ruff is a Scientist based in Sydney, Australia. Her research interests and previous scientific experience include environmental science, geography, biotechnology, mariculture, marine spatial planning, stakeholder engagement, and spatial ecology. She is a Postdoctoral Researcher at University of Sydney and a Project Manager at Offshore Biotechnologies. Prior to her work in Sydney, Bess was a Postdoctoral Researcher for over 2 years at Florida State University. She received a PhD in Geography from Florida State University, with a doctoral dissertation entitled "Culturing a Sustainable Seafood Future: How Governance, Economics, and Society Are Driving the Global Marine Aquaculture Industry”. She received her MA in Environmental Science and Management from the University of California, Santa Barbara in 2016. She has conducted survey work for marine spatial planning projects in the Caribbean and provided research support as a graduate fellow for the Sustainable Fisheries Group. Bess Ruff, MA Bess Ruff, MA Environmental Scientist Expert Answer The number of protons in an atom of an element is represented by its atomic number which is located at the top of the element's box on the periodic table Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 16 Helpful 46
  • Question Where do I find the lighter atomic mass on a periodic table? Bess Ruff, MA Bess Ruff, MA Environmental Scientist Bess Ruff is a Scientist based in Sydney, Australia. Her research interests and previous scientific experience include environmental science, geography, biotechnology, mariculture, marine spatial planning, stakeholder engagement, and spatial ecology. She is a Postdoctoral Researcher at University of Sydney and a Project Manager at Offshore Biotechnologies. Prior to her work in Sydney, Bess was a Postdoctoral Researcher for over 2 years at Florida State University. She received a PhD in Geography from Florida State University, with a doctoral dissertation entitled "Culturing a Sustainable Seafood Future: How Governance, Economics, and Society Are Driving the Global Marine Aquaculture Industry”. She received her MA in Environmental Science and Management from the University of California, Santa Barbara in 2016. She has conducted survey work for marine spatial planning projects in the Caribbean and provided research support as a graduate fellow for the Sustainable Fisheries Group. Bess Ruff, MA Bess Ruff, MA Environmental Scientist Expert Answer Since atomic mass is the combined weight of the particles in the nucleus, it increases along with atomic number, which is the number of protons in an atom of that element. As such, lighter atomic mass is found in the upper left corner of the table and increases with atomic number moving to the right and down the table. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 16 Helpful 30
  • Question What happens when you take away electrons? Community Answer Community Answer The atom becomes a positively charged ion. It will be positively charged because the number of protons is now greater than the number of electrons. Protons are positively charged, while electrons are negatively charged. Usually an atom has the same number of electrons as protons, but when there are more protons, the atom has an overall positive charge. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 25 Helpful 100
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  • Reading the periodic table is hard for many people! Don’t feel bad if you’re struggling to learn how to use it. Thanks Helpful 16 Not Helpful 1
  • Colors may vary, but the information is the same. Thanks Helpful 12 Not Helpful 3
  • Some periodic tables may simplify the information. For example, they may provide just the symbol and atomic number. Look for a table that meets your needs. Thanks Helpful 7 Not Helpful 2
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References

  1. ↑ https://www.amnh.org/explore/ology/physics/how-to-read-the-periodic-table
  2. ↑ https://www.thescienceacademy.sg/breaking-down-the-periodic-table/
  3. ↑ https://chemistrytalk.org/how-to-read-the-periodic-table/
  4. ↑ https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:atomic-structure-and-electron-configuration/a/the-periodic-table-electron-shells-and-orbitals-article
  5. ↑ https://www.asbmb.org/asbmb-today/science/020721/a-brief-history-of-the-periodic-table
  6. ↑ https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:atomic-structure-and-electron-configuration/a/the-periodic-table-electron-shells-and-orbitals-article
  7. ↑ https://chemistrytalk.org/how-to-read-the-periodic-table/
  8. ↑ https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_Chemistry_-_The_Central_Science_(Brown_et_al.)/02%3A_Atoms_Molecules_and_Ions/2.05%3A_The_Periodic_Table
  9. ↑ https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_Chemistry_-_The_Central_Science_(Brown_et_al.)/02%3A_Atoms_Molecules_and_Ions/2.05%3A_The_Periodic_Table
More References (7)
  1. ↑ https://www.amnh.org/explore/ology/physics/how-to-read-the-periodic-table
  2. ↑ https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_Chemistry_-_The_Central_Science_(Brown_et_al.)/02%3A_Atoms_Molecules_and_Ions/2.05%3A_The_Periodic_Table
  3. ↑ https://www.jlab.org/stem
  4. ↑ https://www.jlab.org/stem
  5. ↑ https://www.jlab.org/stem
  6. ↑ https://www.jlab.org/stem
  7. ↑ https://www.bbc.co.uk/bitesize/guides/z3sg2nb/revision/4

About This Article

Ronitte Libedinsky, MS Co-authored by: Ronitte Libedinsky, MS Chemistry and Biology Tutor This article was co-authored by Ronitte Libedinsky, MS and by wikiHow staff writer, Danielle Blinka, MA, MPA. Ronitte Libedinsky is an Academic Tutor and the Founder of Brighter Minds SF, a San Francisco, California based company that provides one-on-one and small group tutoring. Specializing in tutoring mathematics (pre-algebra, algebra I/II, geometry, pre-calculus, calculus) and science (chemistry, biology), Ronitte has over 10 years of experience tutoring to middle school, high school, and college students. She also tutors in SSAT, Terra Nova, HSPT, SAT, and ACT test prep. Ronitte holds a BS in Chemistry from the University of California, Berkeley, and an MS in Chemistry from Tel Aviv University. This article has been viewed 658,200 times. 79 votes - 72% Co-authors: 27 Updated: November 18, 2025 Views: 658,200 Categories: Chemistry Article SummaryX

The periodic table can seem a little daunting at first. But it’s not too difficult to understand once you learn the basics of how it works. When you’re reading the periodic table, move across the table from top left to bottom right. As you move across the table, the number of protons and the atomic mass of each element increases. Each element has its own atomic number, which represents the number of protons in one atom of the element. For instance, the first element in the periodic table, hydrogen, has an atomic number of 1, because a hydrogen atom has only 1 proton. At the other extreme, an atom of the synthetic element oganesson has 118 protons and an atomic number of 118. The elements are also organized into groups, or families, that share similar physical and chemical properties. Each column in the periodic table, going from top to bottom, represents one of these groups. Additionally, related elements are usually color-coded to indicate whether they are metals, semi-metals, or non-metals. When you read the period table in rows going across from left to right, you will find that the elements in each row share the same number of atomic orbitals. The orbitals are the regions around the atom’s nucleus where electrons are most likely to appear. Each of these 7 rows is called a “period.” Finally, you might notice that there are gaps in the periodic table, particularly in the top 3 rows. This is because the elements don’t always fit neatly into groups that share the same physical and chemical characteristics. One group of elements that have nearly indistinguishable chemical properties, called the rare earth elements, is separated out into its own separate space at the bottom of the periodic table. When you look at individual elements on the periodic table, there are several pieces of information that you can find on each square. For example, every element has a 1 to 3-letter symbol that represents the name of the element. While some of these are pretty obvious, like O for oxygen and C for carbon, others don’t necessarily match the common name of the element. For instance, the symbol for lead is Pb, from the Latin word for lead, plumbum. In addition to the element symbol, you’ll also see the atomic number at the top of the square, which represents the number of protons in an atom of the element. Unless the element is ionized, the number of protons will be equal to the number of electrons. Another number that appears in each square is the atomic weight, which is usually written as a whole number with a decimal after it. This number represents the combined weight of all the particles in the atom’s nucleus, including protons and neutrons. You can use this number to figure out things like the number of neutrons in an atom of the element. To do this, round up the atomic weight to the nearest whole number to find the mass number, then subtract the number of protons. The resulting number is the number of neutrons in the atom. For tips on how to remember the elements by their letter symbols, read on! Did this summary help you?YesNo

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