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Questions  >>  SAT  >>  Chemistry  >>  Atomic Structure
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Q)

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

$\begin{array}{1 1}(a)\;Na ( atomic no.=23)\\(b)\;Kr ( atomic no.=36)\\(c)\;K ( atomic no.=26)\\(d)\;Ca ( atomic no.=40)\end{array}$

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A)
electronic configuration of Kr ( atomic no.=36) =1s 2 2s 2 2p 6 3s 2 3p 6 3d 104s 2 4p 6
Total no. of s-electrons = 8,
total no. of p-electrons = 18.
Difference = 10
No. of d- electrons = 10
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