Across
- 5. what is the 5th element in the periodic table
- 6. what has a negative charge
- 7. how many regions does the atom have
- 9. what is the 19th element on the periodic table
- 10. within the extra nuclear region, are found.......... concentric orbits
- 11. the amount of protons in the nucleus is called .....
- 12. who was an english physicist
- 14. what is the lightest element in its gaseous state
- 15. what words represent the amount of protons and neutrons in the nucleus
- 18. what has momentum but no electric charge
- 20. what particle does the extra nuclear region have
- 21. who discovered the electron
- 23. what takes up approximately 99% of an atoms volume
Down
- 1. what do you call atoms that have the same amount of protons but different amount of neutrons
- 2. what is the smallest part of matter
- 3. what is the element for the symbol NA
- 4. what charge does a neutral atom have
- 8. who discovered the neutron
- 11. what is the shortened way of saying atomic mass units
- 13. who was the first person to discover the atom
- 16. when representing an element , what is the minimum of items you must have
- 17. what charge does a proton have
- 19. a ....... atom has the same amount of protons and electrons
- 22. how much atomic mass unit does a neutron have