[ProblemSets]

is solid bromine more dense than liquid bromine??

[Tomtom]

Yes. I believe all solids are more dense than liquids.

For denseness:

Solid>Liquid>Gas

[Dan]

Yes. I believe all solids are more dense than liquids.

Really? Why is an ice cube floating in my glass of water?

In the case of bromine, I expect that the solid is more dense than the liquid.

[Tomtom]

You are of course, completely right; My bad! I can't believe I said what did!

I believe Bromine is, unlike water (which is rather special). It does not expand when it freezes. Therefore, it's density will increase when solid.

[Dan]

Yes, almost all substances do contract when they freeze (ie become more dense).

Notable exceptions besides water ase bismuth and antimony.

[exec]

Water contracts when ice melts because of hydrogen bondings.

In the form of ice, molecules are arranged in such a way that number of H-bonds are maximized. Due to this many bonds, there are a lot of space amongst them which results in higher volume in the ice form, and thus lower density.

When ice melts, some of the H-bonds are broken so that molecules can arrange themselves more compact together. This results in a reduction of volume(reduction of space previously due to H-bonds), and thus an increase in density.

For the case of bromine, there doesn't seem to be any reasons for it to become denser in the liquid form, so your statement should be correct.

[billnotgatez]

exec - what about 

bismuth and antimony

?