Question

The similar chemical properties of a group are repeated in the regular intervals of
a) 2
b) 8
c) 18
d) All​

Answer 1

Answer:

I think

it is 18

ok okokokokok

Answer 2

Answer: The correct option is (d).

Explanation:

Properties which repeat after regular intervals in the periodic table are known as periodic properties.

Periodic properties are the result of repetition of similar outer shell electronic configuration and these regular intervals are $2, 8, 18, 32$.

These are also known as magic numbers.

It can be explained as in Group $18$ (noble gas elements) the configuration of noble gases are:

He (Atomic no. $2$) : $2$

Ne (Atomic no. $10$) : $2, 8$

Ar (Atomic no. $18$) : $2, 8, 8$

Kr (Atomic no. $36$) : $2, 8, 18, 8$

Xe (Atomic no. $54$) : $2, 8, 18, 18, 8$

Rn (Atomic no. $86$) : $2, 8, 18, 32, 18, 8$

Their chemical properties are similar due to the repetition of similar outer shell electronic configuration.

Therefore correct option is (d).

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