Melting and boiling pointsWatch
Do ionisation energies have any effect on melting and boiling points? Or on reactivity?
Is it only forces eg. London forces, hydrogen bonding that effect mp/bp.
And in what type of questions do you talk about electron shielding, proton number etc? Getting a bit muddled
Melting/boiling points aren't affected by ionisation energies however, as these are only affected by the type and strength of bonding/forces between atoms and molecules.
You talk about electron shielding and proton number in questions where it asks about the trend in ionisation energies, or the trend in reactivities. Going down a group, there's more shells and so more shielding, meaning there's less attraction between the nucleus and the outer electrons, so they can be lost more readily (so lower ionisation energy/greater reactivity with each successive element). Going across a period, there's the same amount of shells and so similar shielding, but there's a greater number of protons, so the greater nuclear charge increases the attraction between the nucleus and the outer electrons (so greater ionisation energy/less reactivity with each successive element).