Chemistry

2. the proton is a positive electric charge.
4. a stable subatomic particle with a charge of negative electricity.
5. Electron: a valence electron is an outer shell electron that is associated with an atom.
6. Chemistry is the scientific discipline involved with elements.
8. Levels: Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found.
9. the basic unit of a chemical element.

1. a subatomic particle of about the same mass as a proton but without an electric charge.
3. the central part of an atom that comprises nearly all of the atomic mass and that consists of protons and neutrons.
6. reaction: a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.
7. Cloud: An electron cloud is the region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital.