O=-2
a. H2O, 2H + O = 0, 2H +(-2) = 0, 2H = 2, H=+1
b. NaH, Na=+1, H=-1
c. HNO3 => H⁺ + NO3⁻ , H=+1
d. H2O2, 2H + 2O=0, 2H + 2(-2) = 0, 2H = 4, H=+2
e. H2 = 0
a. H2O, 2H + O = 0, 2H +(-2) = 0, 2H = 2, H=+1
b. NaH, Na=+1, H=-1
c. HNO3 => H⁺ + NO3⁻ , H=+1
d. H2O2, 2H + 2O=0, 2H + 2(-2) = 0, 2H = 4, H=+2
e. H2 = 0
biloks H terkecil H=-1, (b) NaH
