Science Buddies: "Ask an Expert"

Forthe molecule K2S, what is it called? what bond does it have (show evidence)? how many atoms are present in the molecule? list 3 physical properties of the substance based upon bond type? describe how each of the elements in the molecule differ in terms of sub-atomic particles?

Hi!
For future reference, this forum is usually geared toward questions related to science fair projects, and not towards homework help per se. But in any case, K2S is potassium sulfide, and is made up of ionic bonds. There are 3 atoms present in one molecule, and based on the bond type, we can determine things like melting point, boiling point, and solubility.