Question

match the atomic number 4, 8, 14, 15 and 19th with each of the following number 1 and solid non metal of valency 3 number to a gas of valency 2 Number 3 a metal of balance
number 4 or nonmetal of valency 4

Answer 1

1. 15. phosphorus.
2.8. Oxygen
3.14. Silicon but it's a metalloid.