chem help urgent!

i only have one submission for these and i dont' really know how to tell which one has the higher boiling point. can you help?

Of each pair of solids, which one has the higher melting point?

Kr(s) or Cu(s)


CCl4(s) or SiCl4(s)

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  1. nvm i got it wrong:(

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  2. Kr is a gas. Right? Cu is a solid. Right? So which do you think boils (melts, even) higher.

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