Question

the electronic configuration of some elements are given in the table answer the questions based on this data .( A )1s^2 2s^1 ( B) 1s^2 2s^2 2p^6 3s^2 3p^6 (C) 1s^2 2s^2 2p^6 3s^1 (D)1s^2 2s^2 2p^5​

Answer 1

Explanation:

Solution

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Correct option is C)

A number of electrons present in valence shell of penultimate Shell represents the group of elements.

For s block elements: no.of group=number of valence shell electron.

p block elements: no. of group= 2 + 10 + number of valence electrons.

d block elements: no. of group= number(n-1)d electrons + number of electrons in nth shell.

Here, the differential electron is in p orbital hence, it belongs to p block

No. of group= 2+ 10 + 3=15 i.e 15th group or VA group