Question

An element "X" has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of X and also write group and period no.and valency of X.

Answer 1

the atomic number of element X is 18
the electronic configuration of the given element is 2,8,8

group: 18
period : 3
valency:0

Answer 2

chlorine is the element with atomic

number 17

electronic configuration 2,8,7

group 17

period 3

velancy 1 and valence electron 7

it gain one electron

so non metal