Electron Shells and Valence Electrons

Electrons are negatively charged subatomic particles that occupy regions around the positively charged nucleus of an atom. Their location is linked to energy levels called shells. They are also grouped into sub-shells and orbitals within each shell.

An electron’s shell shows its general energy le...

Electrons are small subatomic particles with a negative electrical charge.

Because they are negatively charged, electrons are attracted to the positively charged nucleus. They occupy energy levels, called shells, around the nucleus. Each energy level contains smaller regions called orbitals, where electrons are most likely to be fou...