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Q.

In the fourth period of the periodic table, how many elements have one or more 4d electrons?

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a

2

b

0

c

18

d

6

answer is C.

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Detailed Solution

in fourth period elements 3d sub shell is filled but not 4d, there no element will have 4d electron in fourth period

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In the fourth period of the periodic table, how many elements have one or more 4d electrons?