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If Aufbau rule is not followed, K – 19 will be placed in the block

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a

s

b

p

c

d

d

f

answer is C.

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Detailed Solution

If Aufbau's principle is not followed then energy of orbital follow the order1s<2s<2p<3s<3p<3d<4s<4p<4d<4fK(Z=19)....1s22s22p63s23p63d1"K" will be placed in the d-block

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