Across
- 4. The number of protons in the nucleus of each element.
- 5. The average mass of the nucleus of that element.
- 8. Characteristics of elements that help to identify what they are.
Down
- 1. An abbreviation for the name of an element on the periodic table.
- 2. pure substance made of only one type of atom
- 3. Elements arranged in vertical columns of the periodic table that share the same properties.
- 6. The basic unit of matter made up of protons, neutrons, and electrons.
- 7. Elements that are good conductors of electricity and thermal energy and are often solid at room temperature.
- 8. Repeating rows of the periodic table that demonstrate patterns of how elements are arranged.