Are metalloids ionic or covalent

Answer 1

Well a good way of finding out is the check the electro-negativity between a non-metal and metalloid. I know that if the electro negativity is above 1.7 than it's an ionic compound, if it's below it's covalent.

In this example I'll use silicon and sulfur.

Si--------------S

1.8 2.5

E(S-Si)=2.5-1.8=0.7

It appears that silicon and sulfur would most likely form an covalent compound.

Therefore metalloid when put with non-metals will most likely form covalent compound.

I hope this helps :)

Frank