Chemistry Vocab

5. Neutral particle that exists within the nucleus of an atom.
7. Negatively charged particle that orbits an atom's nucleus.
8. Positively charged particle that exists within the nucleus of an atom.
9. When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties.
11. A row of chemical elements.

1. The electrons in the outermost shell,or energy level, of an atom.
2. A column in the periodic table of the chemical elements.
3. Atoms that have the same number of protons but different numbers of neutrons.
4. The smallest part of a substance that can't be broken down chemically.
6. an atom that has an electric charge because it's either lost or gained one or more of its electrons.
10. Fixed energy state an electron occupies within an atom.