Across
- 2. A homogenous mixture.
- 4. a substance that cannot be broken down to simpler substances.
- 7. A substance composed of atoms of two or more different elements.
- 11. A solution with a pH above 7.
- 12. A force that holds together the elements in a compound.
- 14. The number of protons and neutrons combined.
- 16. A solution with a pH below 7.
- 17. A particle that is part of an atom with a negative charge.
- 18. An atom that has a charge because it has lost or gained electrons.
- 19. The process of a solid changing to a gas.
- 20. Different versions of an element that have more or fewer neutrons.
Down
- 1. The process of a gas changing to a liquid.
- 3. A particle in the nucleus of an atom and has no charge.
- 5. A particle in the nucleus of an atom and has a positive charge.
- 6. A chemical bond where electrons are shared.
- 8. The center of an atom that contains the protons and neutrons.
- 9. The process of a liquid changing to a gas.
- 10. A chemical bond where electrons are exchanged not shared.
- 13. The number of protons in an atom of an element.
- 15. The electrons in the outermost shell of an atom.