Across
- 4. A fixed amount of energy (two words).
- 6. One of two letters that identifies an element (two words).
- 7. More than one substance.
- 9. Single atom's proton and neutrons (two words).
- 10. The center of an atom, where neutrons and protons are located.
- 11. Dense, but flows to the shape of container.
- 12. Number of atoms in a compound.
- 13. Elements bonded together, and cannot be separated.
- 14. Evenly mixed solution (two words).
- 16. Not evenly mixed (two words).
- 19. Least dense, occupies container.
- 22. Number of protons (two words).
- 23. Basic unit of a chemical element.
- 24. What it is (two words).
- 25. How much there is (two words).
Down
- 1. Reactivity (two words).
- 2. Something that can be observed with changing substance (two words).
- 3. A particle with a negative charge, it has a mass of zero.
- 5. Low energy (three words).
- 8. Different electron energy levels (two words).
- 15. The average number of protons and neutrons in an atom (three words).
- 16. High energy (three words).
- 17. Atoms with the same amount of protons.
- 18. Two or more atoms stuck together.
- 20. A particle with no charge, it has a mass of one.
- 21. Occupies space and mass.
- 26. Atoms with different amount of neutrons.
- 27. Most dense, defined shape.
- 28. A particle with a positive charge, it has a mass of one.