Fulltext results:
- attomic_structure
- ====== Structure of the Atom ====== The atom is the basic unit of matter and is composed of three types of subatomic particles: protons, neutrons, an... rgy levels. The number of protons in the nucleus is known as the atomic number, which determines the ... ber of electrons it can hold. The outermost shell is known as the valence shell and determines the che