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Question

Give the atomic number of the inert gas atom in which the total number of d-electrons is equal to the difference in the number of total p-and s-electrons.

A
36
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B
18
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C
54
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D
10
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Solution

The correct option is A 36
First inert gas which contains d-electrons is Kr.
1s22s22p63s23p63d104s24p6

Here in this,
Total number of d-electrons=10
Total number of p-electrons=6+6+6=18
Total number of s-electrons=2+2+2+2=8

Difference in total number of p- and s- electrons=18-8=10, which is equal to total number of d-electrons.

So, inert gas is Kr, atomic no. 36.

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