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Question:

Why do melting increase from sodium to aluminium in periods.?

Why do melting increase from sodium to aluminium in periods.?

Answer:

Sodium, magnesium and aluminium are all metalsThey have metallic bonding, in which positive metal ions are attracted to delocalised electronsGoing from sodium to aluminium: - the charge on the metal ions increases from +1 to +3 (with magnesium at +2) - the number of delocalised electrons increases - so the strength of the metallic bonding increases and - the melting points and boiling points increase.
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