Chem help please?

Question

Electrons in an unfilled shell are called_______ electrons.
Let M stand for any alkali metal atom. In the reactions of alkali metals with water
2M (s) + 2H2O (l)> _______ (aq) + H2 (g)
Mg (s) + H2O (g)> ________ (s) + H2 (g)

Let M stand for any alkaline earth metal atom larger than Mg. In the reactions of M with water
M (s) + 2H2O (l)> _______ (aq) + H2 (g)

Answer 1

Valence electrons

2M (s) + 2H2O (l) ==> 2MOH (aq) + H2 (g)
Mg (s) + H2O (l) ==> MgO (s) + H2 (g)

M (s) + 2H2O (l) ==> M(OH)2 (aq) + H2 (g)

Answer 2

Electrons in an unfilled shell are usually valence electrons.

The three blanks for compounds would be:
2 MOH
MgO
M(OH)2

Answer 3

1> valence
2>2 MHO
3>MgO
4>M(OH)^2