a) 2 Ca0 + O20 → 2 Ca+2 O -2
Ca0 -2 e- → Ca+2
O0 +2 e- → O -2
Atomu skaits Ca – 1, O – 1, tā ka formula ir O2, reizina ar 2
b) 4 P0 + 5O20 → 2 P2+5O5-2
2 P0 -5 e- → P+5
5 O0 +2 e- → O -2
atomu skaits P – 2, O – 5, tā ka formula ir O2, reizina ar 2
c) Na0 + H2+1O-2 → Na+1O -2H+1+H20
Na0 -1 e- → Na+1
H+1 +1 e- → H0
atomu skaits Na – 1, H – 1, tā ka formula ir H2, reizina ar 2
d) K2+1O -2 + H2+1O -2 → 2K+1O -2H+1
e) S+6O3 -2 + H2+1O -2 → H2+1S+6O4-2
f) 2Al0 + 3S0 → Al2+3S3-2
2 Al0 -3 e- → Al+3
3 S0 +2 e- → S -2