What is the difference between an atom, compound, and mineral???????

Question

Please help, Thanks

Atom= matter in the form of small units
Compound= elements chemically combined
Mineral= inorganic nutrients that regulate many chemicals in the body

for definition of mineral see below

http://en.wikipedia.org/wiki/Mineral

last yearmy school librarian said that wikipedia is an unrealiable source b/c ANYONE can put info on it, therefore, its not neccisarily true

Answer 1

If mineral has a specific gravity of 5.5 how much more matter is there in 1 cm3 of this mineral than in 1 cm3 of water