Question

Questions attached

Answer 1

And the other

Answer 2

The difference in electronegativities will tell you what kind of bond will form.
If under 0.5, I think, it's nonpolar covalent.
If between 0.5 and 1.7 is polar covalent.
And over 1.7 is an ionic bond.

Also, metals have low electronegative values.

Answer 3

Roughly, metal and non metal usually form an ionic bond.
Especially in this case, when electronegativity of metal (A)
Is low.