Which wave in the figure
to the left, (a) or (b), has a
longer wavelength?

Happy new years every one

They are all full and don't need any more electrons in there outer shell.

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic

Idon't mean to be a smart alec, length of atoms' bonds is the simplest way to define it.