This is one of the synoptic things, and it was in unit 1, I jus wanna highlight it and ask:
Li has a smaller atomic radius so is more polarising than Na+ hence in combination with Oxygen it would have a higher melting point.
But what about LiCl or LiBr which one would have a higher melting point, and I ask this because Br- has a bigger atomic radius than Cl- so its more easily polarised and rather than having just ionic bonds you would have covalent bonds too....
right?