Across
- 1. Bond formed when electrons are shared
- 4. Vertical columns on the periodic table
- 8. Positively charged ion
- 11. Number of protons in an atom
- 14. Bond with transferred electrons
- 16. Atoms of the same element with different masses
- 17. Group 18 elements
- 19. Ability of an atom to attract electrons
- 20. Smallest unit of an element
- 21. Mixture with uniform composition
Down
- 2. Particles in the nucleus with no charge
- 3. Anything that has mass and takes up space
- 5. Region where electrons are found
- 6. Mass of protons and neutrons
- 7. Distance between two identical nuclei in a bond
- 9. Energy needed to remove an electron
- 10. Table that organizes elements
- 12. Horizontal rows on the periodic table
- 13. rows on the periodic table
- 15. Elements that are poor conductors
- 18. Negatively charged particle