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I'm not sure about this but I think some things are coloured due to the physical surface of the object. Perhaps someone on here can explain that a little more.
What abt the excited electrons?they re supposed to return totheir ground state,right? As the electrons go back to their ground state, they will release a quntum of energy, so are all substance releasing energy evey moment as there is light?
Quote from: srobert on 27/11/2008 22:25:28I'm not sure about this but I think some things are coloured due to the physical surface of the object. Perhaps someone on here can explain that a little more.http://www.thenakedscientists.com/forum/index.php?topic=18177.0 [nofollow]
all things around us are made up of compounds, and all compounds are made up from atoms. then, what makes the atoms/compounds got color?? is it sth related to the orbitals of atoms?? or the absorbance frequency of the energy levels??!~ hope someone can give me some explanation 
I just love exciting electrons.
My favorite releasers of pretty colours are the metal salts in fireworks that make everyone go oooooooh! As a chemistry teacher magnesium was such a pain.
Personally I would die of an asthma attack if I even looked at a thallium salt.