Q.

Electronic configuration of Sc21 is

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a

1s22s22p63s23p64s23d1

b

1s22s22p63s23p64s13d2

c

1s22s22p63s23p64s03d3

d

1s22s22p63s23p24s23d2

answer is A.

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Electronic configuration of Sc21 is