by Woon Kiat 15 years ago
322
More like this
by Szeru Tan
by ASIF HUQ
by akai wee
by Anthony Dobbs
Containing different kind of atoms
Molecules of compounds
Cl2
CO2
Containing same kind of atoms
Molecules of elements
Examples:
Oxygen gas
Chlorine gas
+1
0
1
-1
1/2000