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Question

There is a recurrence of properties after 2, 8, 8, x and 32 elements in the periodic table. The value of x is:

A
16
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B
18
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C
20
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D
8
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Solution

The correct option is B 18
Electrons in various sub-orbits are filled in the increasing order of their energies as decided by Aufbau rule. 3d sub-orbit is filled after 4s; we can say that 3d is part of 4th period. similarly 4d is part of 5th period and so on.

Period
Orbitals
Elements
1
1s2
1
2
2
2s22p6
4
8
3
3s23p6
4
8
4
4s23d104p6
9
18
5
5s24d105p6
9
18
6
6s24f146d106p6
16
32

Thus there are respectively 2, 8, 8, 18, 18 and 32 elements in first , second, third, fourth, fifth and sixth period. Hence, recurrence of properties takes place after theses number of elements.

Hence, the correct option is B.

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