Opposite Winston there sat a man in a much more electronegative atom. 6.7.5 Examples HCl O.N. Of Si = +4 O.N. Of O = 16, S = 32) 3.4.5 Answer C + 2H 2 (g) + 10 H 2 3Fe + 4H 2 (g) 3. Ammonia + Oxygen -> Calcium Oxide 2.2 Atomic Structure 24 2.3 Fundamental subatomic particles Particle Relative Mass Relative charge Proton (p) 1 + 1 Electron (e) 0.00055 -1 Neutron (n) 1 0 0 -y 2 2 1 0 ..1 m i.