Across
- 1. substances that go into a chemical reaction
- 3. substances produced by a chemical reaction
- 6. a change in which one or more new chemical substances are formed
- 9. pure substances that are made up of two or more elements chemically combined together; can be broken down into elements again by chemical means
- 13. a process in which a substance is changed into one or more new substances
- 14. a pure substance made up of one type of particle, cannot be broken down into simpler substances by means of a chemical change
- 15. formed when atoms transfer electrons to or from other atoms
- 16. a group of related elements that have similar properties
- 17. elements with properties in between metals and non-metal
- 19. compounds made of two elements
- 23. molecules made of two atoms of the same element
- 24. the total number of protons and neutrons in the nucleus
Down
- 2. the center of the atom; contains the protons and neutrons
- 4. the ability of a substance to carry an electrical current
- 5. positively charged particle found inside the atomic nucleus
- 7. a formula that shows the number and types of atoms in a molecule
- 8. smallest independent unit of a pure substance, generally a cluster of atoms formed together
- 10. the number of protons in the nucleus of an atom
- 11. a characteristic of matter that describes how it reacts when undergoing a chemical change
- 12. formed when atoms share electrons
- 18. uncharged particles in the atomic nucleus
- 20. change in form but not in chemical composition; no new substances are formed
- 21. a substance that speeds up a chemical reaction without being used up in a reaction
- 22. the average mass of an atom of an element