Question

Qual o nox do Ca(No2)2 ?

Answer 1

$Ca(NO_{2} ) _{2}$

Ca: nox: + 2
N = ?
O = nox: -2

2 + (N + 2.(-2))2 = 0
2 + 2N + 2.(-4) = 0
2 + 2N - 8 = 0
2N = 8 -2
2N = 6
N = 6
      2
N = 3
  
+2   +3 -2
$Ca(NO_{2} ) _{2}$