Across
- 2. number The sum of the protons and neutrons in the nucleus of an atom.
- 6. number This number identifies the element and is equal to the number of protons
- 8. Weight The weighted average mass of all of an element's isotopes' mass numbers.
- 9. Process used to test a Hypothesis.
- 10. Positively charged subatomic particle found in the nucleus.
- 12. Having nonuniform composition throughout.
- 14. Factor that changes in an experiment.
- 16. A substance that contains only one kind of atom.
- 18. Cloud A visual model showing the likely locations for the electrons in an atom.
- 20. Neutral subatomic particle found in the nucleus.
Down
- 1. The action of purifying a liquid
- 3. Versions of the same element with different numbers of neutrons.
- 4. Observations & measurements recorded.
- 5. Having uniform composition throughout.
- 7. Matter that is physically combined or blended.
- 11. Any compound resulting from one or more elements.
- 13. Negatively charged subatomic particle found outside the nucleus.
- 15. The smallest particle of an element.
- 17. Dense, positively charged mass at the center of an atom.
- 19. An atom with a charge.