Q.

How many elements out of first 100 elements possess 3d electrons?

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a

10

b

40

c

80

d

30

answer is D.

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Detailed Solution

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Elements from atomic number 21 to atomic number 100 have electrons in 3d orbitals.

The total number of electrons =100−20=80

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How many elements out of first 100 elements possess 3d electrons?