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Q.

The outer electronic configuration of La (atomic No. 57) is:

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a

5s25p6

b

5s25p54f2

c

5s25p64f1

d

5s25p65d1

answer is B.

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Detailed Solution

Atomic no. 57 is of lanthanum

and its electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 5d1 6s2

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