Question

write period number of an element whose electronic configuration of Valence shell 4s¹​

Answer 1

Answer:

ANSWER

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

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

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

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 group

Explanation:

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