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How many elements are accommodated in each period in the periodic table?
Asked by Sayoni Maiti | 28 Dec, 2013, 07:34: PM
answered-by-expert Expert Answer

The number of elements in each period is twice the number of atomic orbitals available in the energy level that is being filled.

1. The first period has principal quantum number n=1, contains two elements and corresponds to K-shell.

2. The second period has principal quantum number n=2, contains eight elements and corresponds to L-shell.

3. The third period has principal quantum number n=3, contains eight elements and corresponds to M-shell.

4. The fourth period has principal quantum number n=4, contains eighteen elements.

5. The fifth period has principal quantum number n=5, contains eighteen elements.

6. The sixth period has principal quantum number n=6, contains 32 elements.

7. 14 elements of both sixth and seventh periods i.e. lanthanoids and actinoids respectively are placed separately at the bottom of the periodic table.

Answered by | 30 Dec, 2013, 11:59: AM

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