Question: how many valence electrons do the elements in group 17 have
Answer: Periodic table group Valence electrons Group 1 ( I ) ( alkali metals ) Group 2 ( II ) ( alkaline earth metals ) Groups 3 - 12 ( transition metals ) 3 -- 12 Group 13 ( III ) ( boron group ) Group 14 ( IV ) ( carbon group ) Group 15 ( V ) ( pnictogens or nitrogen group ) 5 Group 16 ( VI ) ( chalcogens or oxygen group ) 6 Group 17 ( VII ) ( halogens ) 7 Group 18 ( VIII or 0 ) ( noble gases ) 8