Question

An element to 3rd period and 17th group of the periodic table, find out
a)-The electronic configuration of element on its left and right
b)- It's valence electrons
c)- It's size with in composition with neighboring elements​

Answer 1

ELEMENT=> Chlorine [Cl]

E.C.=> S=2,8,6 ; Ar=2,8,8

Valence Electrons => 1

Same in size but a little difference comparing neighboring elements