Валентность H20 Ca2 ggggggggggggg

Question

Валентность H20 Ca2 ggggggggggggg

Answer 1

H - 1 , O - 2 .
Ca - 2 .

Answer 2

H⁺¹₂O²⁻, Ca²⁺
2Ca + 2H₂O = 2CaOH + H₂
2Ca⁰ + 2H₂O = 2Ca²⁺ + 2OH⁻ + 2H⁺
H₂O = OH⁻ + H⁺