Why are the outermost electrons of atoms important?
The outermost electrons of an atom are essential indicators of the properties of matter.
Period 2 and 3 elements, such as carbon, oxygen, and nitrogen can exist in a very stable state if the outermost 8 electrons are filled. (octet rule)
As a period one elements, hydrogen exists in a very stable state when the outermost two atoms are filled.
2022.12.18 Update: Support for double bonds and triple bonds.