Ionic bonds and covalent bonds:
Ionic Bond(s) for:
K&S -> K2S
N&Be -> Be3N2
Al&P -> AlP
Covalent Bond(s) for:
C&F -> CF4
S&O -> OS
Cl&Se -> SeCl4
Chemistry - bobpursley, Thursday, October 13, 2011 at 9:00pm
Be and N are an odd couple, it is about half way ionic and half covalent. Save the why when you study electonegativity and Paulings scale.
Aluminum and P is another odd couple. It is mostly covalent, but has some polar nature.