Across
- 6. Positively charged particle
- 9. For example, protons, neutrons and electrons
- 10. A row on the periodic table
- 11. The number of protons in the nucleus of the atom
- 13. A atom with a net charge
- 14. The average mass of an atom, calculated by adding the protons and neutrons
- 16. Neutral charged particle
- 17. The number of protons and neutrons in the nucleus of the atom
- 18. Type of bonding in which atoms share electrons
- 19. Another model of the atom
Down
- 1. Electrons of the last shell of an atom
- 2. Smallest unit of all things
- 3. Two or more atoms combine
- 4. One model of the atom
- 5. Negatively charged particle
- 7. A column on the periodic table
- 8. the mass of an atom
- 11. Arranges the chemical elements into periods and groups
- 12. Type Atoms gain or lose electrons
- 15. How atoms combine to form molecules