The Lightest Metal Known Is A Beryllium B Lithium C Class ... - Vedantu

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AnswerQuestion Answers for Class 12Class 12 BiologyClass 12 ChemistryClass 12 EnglishClass 12 MathsClass 12 PhysicsClass 12 Social ScienceClass 12 Business StudiesClass 12 EconomicsQuestion Answers for Class 11Class 11 EconomicsClass 11 Computer ScienceClass 11 BiologyClass 11 ChemistryClass 11 EnglishClass 11 MathsClass 11 PhysicsClass 11 Social ScienceClass 11 AccountancyClass 11 Business StudiesQuestion Answers for Class 10Class 10 ScienceClass 10 EnglishClass 10 MathsClass 10 Social ScienceClass 10 General KnowledgeQuestion Answers for Class 9Class 9 General KnowledgeClass 9 ScienceClass 9 EnglishClass 9 MathsClass 9 Social ScienceQuestion Answers for Class 8Class 8 ScienceClass 8 EnglishClass 8 MathsClass 8 Social ScienceQuestion Answers for Class 7Class 7 ScienceClass 7 EnglishClass 7 MathsClass 7 Social ScienceQuestion Answers for Class 6Class 6 ScienceClass 6 EnglishClass 6 MathsClass 6 Social ScienceQuestion Answers for Class 5Class 5 ScienceClass 5 EnglishClass 5 MathsClass 5 Social ScienceQuestion Answers for Class 4Class 4 ScienceClass 4 EnglishClass 4 MathsThe lightest metal known is (A) beryllium(B) lithium (C) sodium (D) boronAnswerVerified547.5k+ viewsHint: A light metal is any metal of relatively low density. density = $ \dfrac{{mass}}{{volume}} $ As we can see density is directly proportional to mass (in this case, atomic mass). So, we can compare different metals on the basis of atomic mass.Less will be the atomic mass, lee will be density, lighter will be the metal.Complete solution step by step:Atomic mass of beryllium = $ 9 $ uAtomic mass of lithium = $ 7 $ uAtomic mass of sodium = $ 23 $ uAtomic mass of boron = $ 11 $ uWe can clearly observe here that the atomic mass of lithium is least among these ( $ 7 $ u). Therefore, it will be having the least density and so will be the lightest metal.So, the correct option would be B: lithium.Additional information: When we talk about a material being lightweight, what we are really discussing is density. Density is the amount of matter per unit of volume. The less matter is there in space, the lighter the substance is. So, the lightest metallic element is the one with the lowest density. The lightest or least dense element which is a metal is lithium. The atomic number of lithium is $ 3 $ u. Among all the alkali metals, lithium is highly reactive because of its small size. The reason why alkali metals are so light is because these elements are the first atoms in their period on the periodic table to gain an additional electron shell.In a periodic table, on moving down the group, the atomic radius increases resulting in an increase in density of elements. On moving from left to right in a period, atomic radius decreases resulting in decrease in the density of the elements.Note:Lithium is the lightest metal because it is placed in the first group of periodic tables (in alkali metal group) and it has the lowest atomic weight. We can also solve this problem by the concept of atomic number. Less will be atomic number, lighter the element will be. However, there are some exceptions too which should be kept in mind.Recently Updated PagesMaster Class 11 Computer Science: Engaging Questions & Answers for SuccessMaster Class 11 Business Studies: Engaging Questions & Answers for SuccessMaster Class 11 Economics: Engaging Questions & Answers for SuccessMaster Class 11 English: Engaging Questions & Answers for SuccessMaster Class 11 Maths: Engaging Questions & Answers for SuccessMaster Class 11 Biology: Engaging Questions & Answers for SuccessMaster Class 11 Computer Science: Engaging Questions & Answers for SuccessMaster Class 11 Business Studies: Engaging Questions & Answers for SuccessMaster Class 11 Economics: Engaging Questions & Answers for SuccessMaster Class 11 English: Engaging Questions & Answers for SuccessMaster Class 11 Maths: Engaging Questions & Answers for SuccessMaster Class 11 Biology: Engaging Questions & Answers for Success

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