Вопрос химия, срочно очень даю 98 баллов без обмана

MnO - Mn = 2, O = 2

MnO2 - Mn = 4, O = 2

FeO - Fe = 2, O = 2

Fe2O3 - Fe = 3, O = 2

CrO3 - Cr = 6, O = 2

CaH2 - Ca = 2, H = 1

AlCl3 - Al = 3, Cl = 1

TiO2 - Ti = 4, O = 2

NaCl - Na = 1, Cl = 1

Li3N - Li = 1, N = 3

K2O - K = 1, O = 2

HgO - Hg = 2, O = 2

ZnO - Zn = 2, O = 2

Mn, O, Fe, Ca, Hg, Zn