Across
- 2. The smallest unit of an element that retains properties
- 4. The smallest unit of a compound
- 8. The central core of an atom
- 11. The state of matter with definite shape and volume
- 13. A substance composed of two or more elements
- 15. The state of matter with no definite shape or volume
- 16. A substance that cannot be broken down by chemical means
- 17. A substance that speeds up a chemical reaction
- 18. A pure substance that cannot be broken down further
- 22. Electrons that are found in these energy levels
- 23. A measure of an atom's attraction for electrons
- 27. The force that keeps atoms or ions together in a solid
- 29. The process of a gas changing into a liquid
- 30. A change in matter that produces a new substance
Down
- 1. The energy required to change a substance's state
- 3. Particles with no charge in an atom's nucleus
- 4. The number of protons plus neutrons in an atom
- 5. A charged particle formed by gaining or losing electrons
- 6. The process of a liquid changing into a solid
- 7. A change in matter that does not produce a new substance
- 9. A mixture that is the same throughout
- 10. The measure of how hot or cold something is
- 12. The attractive force between oppositely charged ions
- 13. The bond formed by the sharing of electrons
- 14. Atoms of the same element with different neutron numbers
- 19. The process of a liquid changing into a gas
- 20. A mixture with visibly different parts
- 21. The process of a solid changing into a liquid
- 24. A fundamental particle with a negative charge
- 25. Positively charged particles in an atom's nucleus
- 26. The number of protons in an atom's nucleus
- 28. The state of matter with a definite shape and volume