Atomic Theory

1. A unit of calculation that describes the sum of the mass of a substance per mole.
3. A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge.
7. The total number of protons and neutrons in a nucleus.
9. A standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
12. The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
13. The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
14. A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
15. Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
17. A particle representing a quantum of light or other electromagnetic radiation.

2. A Greek word that means unable to be cut or divide.
4. Unified atomic mass unit , another name for atomic mass unit.
5. A negatively charged particle, located in the outermost shell of an atom.
6. A location where an electron is likely to be found in an atom.
8. An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable.
10. The positive charged metal plate at the end of a vacuum tube.
11. A subatomic particle of about the same mass as a proton but without an electric charge.
16. The negative charged metal plate at the end of a vacuum tube.