If aufbau rule is not followed, 20Ca will be placed in .......... block
p-
s-
f-
d-
A
f-
B
s-
C
p-
D
d-
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Solution
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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.
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