▁( Z n ) ▁is ▁an ▁element ▁in ▁group   1 2 . ▁Z inc ▁is ▁one ▁of ▁the ▁main ▁components ▁of ▁br ass , ▁being ▁used ▁since ▁the ▁ 1 0 th ▁century ▁B CE . ▁Z inc ▁is ▁also ▁incred ibly ▁important ▁to ▁humans ; ▁almost ▁ 2 ▁billion ▁people ▁in ▁the ▁world ▁suffer ▁from ▁z inc ▁def ic iency . ▁ ▁However , ▁too ▁much ▁z inc ▁can ▁cause ▁co pper ▁def ic iency . ▁Z inc ▁is ▁often ▁used ▁in ▁batter ies , ▁apt ly ▁named ▁carbon - z inc ▁batter ies , ▁and ▁is ▁important ▁in ▁many ▁plat ings , ▁as ▁z inc ▁is ▁very ▁cor ros ion ▁resist ant . ▁ ▁p - block ▁elements ▁ ▁Gal li um ▁ ▁Gal li um ▁( G a ) ▁is ▁an ▁element ▁in ▁group   1 3 , ▁under ▁al umin ium . ▁Gal li um ▁is ▁not ew orth y ▁because ▁it ▁has ▁a ▁mel ting ▁point ▁at ▁about ▁ 3 0 3 ▁k el v ins , ▁right ▁around ▁room ▁temperature . ▁For ▁example , ▁it ▁will ▁be ▁solid ▁on ▁a ▁typical ▁spring ▁day , ▁but ▁will ▁be ▁liquid ▁on ▁a ▁hot ▁summer ▁day . ▁Gal li um ▁is ▁an ▁important ▁component ▁in ▁the ▁al loy ▁gal inst an , ▁along ▁with ▁tin . ▁Gal li um ▁can ▁also ▁be ▁found ▁in ▁sem icon duct ors . ▁ ▁German ium ▁ ▁German ium ▁( Ge ) ▁is ▁an ▁element ▁in ▁group   1 4 . ▁German ium