Na, Mg and Al are metals with giant structures. They form ionic compounds.
Si is a metalliod. It can make four covalent bonds.
P, S and Cl are non-metals and either form ionic or covalent compounds.
Ar is a noble gas so is unreactive.
Melting points: Giant structures have very high melting points, while molecular or atomic structures have lower ones.
Increases from Na to Al due to metallic bonding - charge of ion increases, so number of delocalised electrons increases, creating a stronger bond.
Silicon has a giant structure and therefore a high melting point.
M.p.s of non-metals depends on van der Waals forces, so molecules with more electrons and which can fit together more closely will have higher melting points.
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