Atoms Review

2. Unreactive group in the periodic table.
7. A vertical row of elements in the periodic table.
9. An atom that has the same number of protons but a different number of electrons.
11. Subatomic particle with a positive charge.
12. Subatomic particle with a negative charge.
13. The sum of the number of protons and neutrons in the nucleus of an atom.

1. A unit of an element that maintains the properties of that element.
3. A region around the nucleus of an atom where electrons are found.
4. Subatomic particle with no charge.
5. Combine with most metals to form salts.
6. The number of protons in an element.
8. A horizontal row of elements in the periodic table.
10. Law that states the properties of elements in the periodic table change in a pattern.