Question

why magnesium has low boiling point than calcium

Answer 1

Excellent question. I’ll try to answer it. You see Calcium and Magnesium are group two elements. The Group 2 elements are all metals with metallic bonding, so you expect their melting points to be high. In metallic bonding, metal cations in a metal lattice are attracted to de-localized electrons.. Going down the group the following things happen -

the number of de-localized electrons remains the same ...

the charge on each metal cation stays the same at 2+, but ...

the ionic radius increases ...

so the attraction between the de-localized electrons and the metal cations decreases.


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Answer 2

Because the metallic bond in magnesium is stronger than calcium, the magnesium atoms are loosely packed compared to the calcium.

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