Across
- 2. Protons, neutrons, electrons, and a nucleus are all part of an _____.
- 3. _____(s)are positively charged atoms.
- 7. This element has 79 protons.
- 8. I am in the 8th group and have 30 neutrons.
- 11. _____(s) have no charge.
- 12. My atomic mass is 20.18.
- 13. _____(s) are equal to the weight of one proton.
- 15. I am a actinide with 99 neutrons.
- 17. _____(s) are negatively charged.
- 18. _____(s) are positively charged.
- 19. I am the first element in the 6th period.
Down
- 1. This number also tells you the number of protons in an atom.
- 4. _____(s) are atoms that have the same number of protons, but have a different number of neutrons.
- 5. I am a metal and have 60 neutrons.
- 6. The symbol of this element is W.
- 9. _____(s) are negatively charged atoms.
- 10. This number is a decimal.
- 14. A gas with 8 protons and 8 neutrons.
- 16. _____ is between the nucleus and electrons of an atom.
- 20. _____(s) are charged atoms.