Across
- 3. horizontal rows of elements in the periodic table.
- 5. the space around a nucleus that electrons are found
- 6. smallest particle of an element.
- 7. negatively charged practical of 1-.
- 9. the chart that measures the elements.
- 10. number of protons in the nucleus.
- 12. vertical rows of elements in the periodic table.
- 14. The sum of the protons and neutrons in a nucleus.
Down
- 1. weighted average mass of all natural isotopes of an element.
- 2. The chemical symbol of an element surrounded by dots
- 4. An atom with the same element but has different numbers of neutrons.
- 8. neutral charged particle.
- 9. particles with an electric charge of 1+.
- 11. small positively charged center of the atom.
- 13. things that compose protons and electrons.