What does hydrogen helium lithium berylium and boron have in common?

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Phosphorous can form an ion called phosphide, which has the formula p3−. this ion can form an ion called phosphide, which has the formula p3−. this ion properties very similar to those of pforms when a phosphorus atom loses three protonsis called a cationcontains 18 electrons

Light waves are as they pass through the