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Which of the following statement (s) is/...

Which of the following statement `(s)` is`//`are correct ?

A

Similar electrons configuration is repeated after intervals of `2,8,8,18` and `32` in the extended form of periodic table.

B

In a period from right ot left `(larr)`, reducing nature increases.

C

Along the period `(rarr)` thye number of valency electrons increases from `1` to `8`.

D

The first member of lanthanide series is lanthanum.

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
All statements (a,b,c and d) are correct.
b. `s`-block elements can undergo oxidation easily (i.e, strong reducing nature) because of low `IE`.
Thus reducing nature increases from the right to the left `(larr)` in a period.
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