The Student Room Group

Can someone explain to me charge density, a level chemistry

So like, why does magnesium have a lower charge density than aluminium?
Reply 1
Because Al has 1 more proton, so the atomic radius is smaller. A greater electrostatic force of attraction between the electron shells and nucleus. Also Al is a smaller atom than Mg.
Original post by Texxers
Because Al has 1 more proton, so the atomic radius is smaller. A greater electrostatic force of attraction between the electron shells and nucleus. Also Al is a smaller atom than Mg.


exactly how is it a smaller atom? I understand its a smaller Ion, but atom?
Reply 3
Original post by Sanjith Hegde123
exactly how is it a smaller atom? I understand its a smaller Ion, but atom?

It has a higher nuclear charge due to more protons so the attraction of the outer electrons and the positive nucleus pulls in the atom. Almost like squishing

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