Question
Give the name and an atomic number of the inert gas atom in which the total number of d-electrons is equal to the difference in numbers of total p and s electrons.
✓
Answer
The Kr is the first Noble gas with atomic number 36 that contains electrons in d-orbit. The electronic configuration of Kr is:
$1 s^2,2 s^2, 2 p^6, 3 s^2, 3 p^6, 3 d^{10}, 4 s^2, 4 p^6$
Total number of d-electrons $=10$
Total number of p-electrons $=18$
Total number of s-electrons $=8$
$\therefore$ Difference in total number of p and s electrons $=18-8=10$
Thus, the inert gas is krypton.
$1 s^2,2 s^2, 2 p^6, 3 s^2, 3 p^6, 3 d^{10}, 4 s^2, 4 p^6$
Total number of d-electrons $=10$
Total number of p-electrons $=18$
Total number of s-electrons $=8$
$\therefore$ Difference in total number of p and s electrons $=18-8=10$
Thus, the inert gas is krypton.
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