Question

An element x having atomic mass 35 and neutrons 18 find its period and group

Answer 1

Atomic number = No. Of electrons = No. Of protons = (mass number) - (no. Of neutrons.)

Atomic number = 35 - 18 = 17.

Element with atomic number 17 is Chlorine. Hence, element X is Chlorine.

Group number = 17

Period number = 2