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Mass Energy Equivalence

If aufbau rul...

Question

If aufbau rule is not followed, $_{20} C a$ will be placed in .......... block

A

s-

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B

p-

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C

d-

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D

f-

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Solution

The correct option is D d-
Calcium-20- ${1 s}^{2} {2 s}^{2} {2 p}^{6} {3 s}^{2} {3 p}^{6} {4 s}^{2}$ . It is the diagonal filling of subshells that are given by Aufbau if is not followed then instead of 4s for two outer electrons 3d is filled.

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