Question

an element A has atoic number 11 and element B has atomic number 17 from which period these element belong if element A combine with B they both form a molecule . write the chemical formula of that molecule​

Answer 1

Explanation:

A=

11 = 2,8,1=> element of 3rd period (Na)

B=

17= 2,8,7=> element of 3rdperiod (Cl)

formation

A(+) +B(-) => AB

[ Na(+) + Cl(-) => NaCl]