Question

Визначьте валеність: CH4, BaS, SO3, N2O5, P2O3, CaCl2, Cu2O, Al4C3

Answer 1

C(IV)H(I)
Ba(II)S(II)
S(VI)O(II)
N(V)O(II)
P(III)O(II)
Ca(II)Cl(I)
Cu(I)O(II)
Al(III)C(IV)