Across
- 3. The number of rows.
- 5. Scientist who developed the Bohr model.
- 7. Inventor of modern periodic table.
- 11. Area where electrons are most likely found.
- 12. the first element.
- 13. Another word for family.
- 15. Atom that has lost or gained one or more electron.
- 16. Positively charged particle.
- 17. How many electrons can be in the third energy level?
- 18. Scientist who formulated an equation to calculate energy levels of electrons.
- 19. A chemical property that describes the tendency of an atom to attract electrons towards itself.
- 20. Same element, different mass.
Down
- 1. The specific patters of an element.
- 2. Rows are called...
- 4. Negatively charged particle.
- 6. The number of elements on the periodic table.
- 8. The majority of elements.
- 9. Each orbital can have no more than ___ electrons.
- 10. The number of columns.
- 14. How many electrons can be in the second energy level?