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Transition Elements

When we move ...

Question

When we move down a group a shell is added inspite of that the fourth and fifth period both have 18 elements each why?

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Solution

The number of elements in each period depends on the number of subshells that is s , p, d and f .
In fourth and fifth period subshells involved are s, p and d .
Number of orbitals of s subshell = 1
Number of orbitals of p subshell =3
Number of orbitals of d subshell =5
Total number of orbitals = 9
Total number of elements = 18 which is twice the total number of orbitals.

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