second column Halogen group - zero group ( inert gases )
third column - very active metals , tend to lose one electron -less reactive than group one , tend to lose 2 electrons - very active nonmetals, tend to gain one electron - Nobel gases , do not gain or lose electrons
Group names: 1st - Alkali metals 2nd - Alkali earth metals 3rd - Halogen 4th - Noble gas
Properties of element in group: 1st - Low melting point, low density, most reactive metal group 2nd - Second most reactive group 3rd - Most reactive group in nonmetal 4th - None reactive group, stable electronic structure