If aufbau rule is not followed, 20Ca 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-20-1s22s22p63s23p64s2. 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.