Question

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

Answer 1

Group number of X is 17

Period number of X is 3

the element X is chlorine

Answer 2

Mass number = no. Of proton+no. of neutron

35=no of proton+18

No. of proton=35-18

=17

Atomic number =number of proton

Atomic number =17

Group number =17

Period =3

X= chlorine