Across
- 1. the smallest particle that is still considered an element
- 2. an atom with the same number of protons but different number of nuetrons
- 4. a particle that has a negative charge
- 6. the sum of protons and neutrons in an element
- 7. a 1 or 2 letter abbreviation for an element
- 9. a scientist who discovered a set of patterns that applies to all elements
Down
- 1. the average mass of all the isotopes in that element
- 3. a particle in the nucleus with a positive charge
- 5. a chart showing all the elements
- 8. a particle in the nucleus with no electric charge