SCIENCE TEST TOMORROW.
1 Hydrogen [H], Lithium [Li], Sodium [Na], Potassium [K]
2 Berylium [Be], Magnesium [Mg], Calcium [Ca]
3 Boron [B], Aluminium [Al]
4 Carbon [C], Silicon [Si]
-3 Nitrogen [N], Phosphorous [P]
-2 Oxygen [O], Sulphur [S]
-1 Fluorine [F], Chlorine [Cl]
0 Helium [He], Neon [Ne], Argon [Ar]