Question

Определить валентность элементов по формулам веществ PH3,MgO,SO3,P2O5,

Answer 1

PH3 (P-3, H-1)
MgO (Mg-2, O-2)
SO3 (S-6, O-2)
P2O5 (P-5, O-2)

Answer 2

P(III)H3(I)

Mg(II)O(II)

S(VI)O3(II)

P2(V)O5(II)

Ca(II)H2(I)

Mn2(VII)O7(II)

Na(I)H(I)

Cl2(I)O(II)