Across
- 3. not chemically combined elements
- 5. negatively charged subatomic particle
- 7. a type of atom
- 8. same element different amount of electrons
- 10. the first group in the periodic table
- 11. a unit of matter with protons, neutrons and electrons
- 12. same element, different amount of neutrons
- 14. an element with 3 protons
- 17. the number of protons + neutrons
- 18. the last group in the periodic table
- 19. the shell around the nucleus with electrons
Down
- 1. a table of elements
- 2. protons and neutrons area
- 4. the columns in the periodic table
- 6. unique symbol for the element
- 9. the rows in the periodic table
- 10. the number of protons in the atom
- 13. positively charged subatomic particle
- 15. chemically combined elements
- 16. neutrally charged subatomic particle