Electronic Configuration Of Elements - Chemistry LibreTexts

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Block of Elements by Highest Occupied Atomic Orbitals

Block of elements by last filled atomic orbitals
1s 2s 3s 4s 5s 6s 7s 4f - - - - - 4f 5f - - - - - 5f 3d - - - 3d 4d - - - 4d 5d - - - 5d 6d - - - 6d 2p - 2p 3p - 3p 4p - 4p 5p - 5p 6p - 6p 7p - 7p

The highest atomic orbitals occupied by electrons determine the properties of the elements. According to this scheme, the periodic table can be divided into s, p, d, and f blocks as seen in the table on the right.

This table shows the filling order of atomic orbitals as

1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p

The s- and p-blocks of elements are called main group elements. The d-block elements are called transition elements The f-block elements are called the inner transition elements.

In an ordinary periodic table, the s, p, and d block elements are in the main body of the Periodic Table, whereas the f block elements are placed below the main body. If we placed them on the same period where they belong, the Periodic Table would be too long for the screen to accommodate. Thus, we keep the Periodic Table in the usual (long) form.

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