4. Why are plastic blocks good for modeling molecules? There are as many different colors as there are atoms.
They can be combined in many different ways.
They come in thousands of different shapes and sizes.
They are rigid and don't easily separate.

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