Why does aluminium have a higher melting point than magnesium?

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when substance melts, of attractive forces holding particles broken or loosened particles can move freely around each other still close together. stronger these forces are, more energy needed overcome them , higher melting temperature.

sodium , aluminium metals. have metallic bonding, in positive metal ions attracted delocalised electrons. going sodium aluminium:

charge on metal ions increases +1 +2
sodium loses electron become positively charged +1
magnesium loses 2 electron become positively charged +2
result ,
number of delocalised electrons increases
strength of metallic bonding increases ,
melting points , boiling points increase

....


Science & Mathematics Chemistry Next



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