CHEMISTRY HELP

help!!!
arrange the following binary hydrides in order of increasing melting points

CaH2, AIH3, NH3, GeH4, CH4

i don't understand how i cant figure it out

I suggest the easy way is to look up the melting points of each and arrange them. The most covalent should be the lowest and the most ionic should be the highest. Right off you figure CH4 is the most covalent and CaH2 is the most ionic. The others are between the high and low.

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