Question

An element "X" has a mass number 35 and the number of neutrons,is 18. Identify the group number and period of "X"

Answer 1

Hi,

Here's ur answer :-

No.of protons = Mass no. -No.of neutrons = 35-18 = 17

Thus the element X is Chlorine.

Chlorine is of group 17 and period 3.

HOPE IT HELPS (^_^)

PLEASE MARK BRAINLIEST

Answer 2

Given
Mass number = 35
no . of neutrons = 18
Atomic number = mass no. - no. of neutrons
                       = 35 -18 = 17
Therefore the name of element X is Chlorine
electronic configuration is 1s2 2s2 2p6 3s2 3p5
Group no. = no.of valence electrons = 2+5=7
period = Valency shell = 3
Therefore the element X belongs to vii A group and 3rd period