IVA: nonmetal/other metals VIIA:halogens VIII: Nobel Gases
I'm pretty sure its an electron. I hope this helps! (:
Answer: Only non-polar medicines can diffuse across the membrane. non-polar drugs are lipid soluble, while polar drugs are water soluble, so polar drugs cant absorb through biological membranes.
Like to check? Just add up the charges on both sides and see if they equal each other:)
