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AS Question on melting/boiling points and metallic bonds

Hi

Why would boiling points give a better idea of metallic bond strength in group 2 elements that melting points would?

Thanks in advance for any help!
?? Isn't boiling/melting point effectively the same thing?
Reply 2
Avatar for alow
alow
19
To measure the metallic bond strength, you have to completely break the metallic bonds.
I don't know because there is NO obvious trend in boiling points of group 2 elements...
There is a trend in melting point though
where is this questions from?
Reply 4
Avatar for TSR George
TSR George
OP
17
Original post by Ze Witcher
?? Isn't boiling/melting point effectively the same thing?


In the deep dark depths of the internet I found this after a while of searching -
In a molten metal, the metallic bond is still present, although the ordered structure has been broken down. The metallic bond isn't fully broken until the metal boils. That means that boiling point is actually a better guide to the strength of the metallic bond than melting point is. On melting, the bond is loosened, not broken.
Reply 5
Avatar for alow
alow
19
Exactly.
Reply 6
Avatar for alow
alow
19
Original post by lawlieto
I don't know because there is NO obvious trend in boiling points of group 2 elements...
There is a trend in melting point though
where is this questions from?


Metallic bonding is a lot more complicated than simple van der Waals stuff, so I wouldn't expect an AS student to be able to rationalise the trend.
Oh :smile: Luckily I don't think I've been penalised for using either term

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