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Q.

If the aufbau principle had not been followed, Ca (Z =20) would have been placed in the :

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a

s-block

b

p-block

c

d-block

d

f-block

answer is C.

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Detailed Solution

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If the aufbau principle had not been followed, then 3d is filled before 4s. Ca (Z = 20) would have been placed in the d-block.

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If the aufbau principle had not been followed, Ca (Z =20) would have been placed in the :