Across
- 3. The number of protons plus neutrons
- 5. Property of an element that you use your senses to observe.
- 7. The number of protons in an atom
- 8. an atom or a group of atoms that has a positive or negative electrical charge due to the loss or gain of electrons
Down
- 1. a one- or two-letter abbreviation used to represent a chemical element
- 2. a one- or two-letter abbreviation used to represent a chemical element
- 4. a chart that arranges chemical elements into rows (periods) and columns (groups) based on their atomic number
- 6. The region where electrons are found in an atom