Across
- 3. the center of an atom
- 4. ab+c->ac+b
- 8. a reaction involving the absorption of heat
- 11. a substance made of different particles
- 14. the same element but with a different number of neutrons
- 16. elements that have full shells
- 17. a reaction that has a release of heat
- 18. the up and down rows on the periodic table
Down
- 1. small number that multiplies the element before it
- 2. ab+cd->ac+bd
- 5. a number in an equation
- 6. the amount of space something takes up
- 7. a substance made by mixing other substances together
- 9. electrons that are in the outermost rings
- 10. the amount of matter an object has
- 12. makes up everything
- 13. the breaking down of a compound
- 14. an unbalanced charge
- 15. the result of a chemical reaction