To draw a Lewis structure for a poly atomic ion, begin by calculating A, the available electrons, and N, the needed electrons.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

it means there are 3 atoms of oxygen