What is a group of atoms that join together?

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound