00:02
We're asked to predict which solid in each pair will have a higher melting point.
00:06
Well, you need to recall that a molten point increases with decreased size and mountain point increases with increased charge.
00:17
Well, looking at na and cs, since cl is fixed, we're just looking at these two atoms.
00:23
So looking at na, we're in group 1 and cl in group 17.
00:33
Oh, no, cs, sorry about that.
00:36
C .s is also in group one, but notice that the, well, naa has a smaller atomic radius in cs, since as we go down the periodic table, our atomic radii increases.
00:51
So because we have a smaller atomic radius for sodium, and the charges are the same for naa and cs, we say that because our atomic radius for sodium is less, our charges are the same.
01:07
So nacl has a higher melting point...