Chemistry

1. unifying explanantion for a broad range of hypothosises and observations.
5. charged particles that form during chemical changes.
7. the substances formed from a chemical reaction.
10. negativley charged particles found in all atoms.
12. representation of an object or a symbol.
13. equation/a shorthand description of a chemical reaction using chemical formulas and symbols.
14. the smallest particle into which an element can be divided and still be the same substance.
15. very reactive nonmetals.
16. a pure substance composed of two or more elements that are chemically combined.

2. a pure substance that cannot be seperated into simpler substances by chemical or physical means.
3. electrons/ electrons in their outter most energy level.
4. combination of two or more substances that are not chemically combined.
6. mixture/ the same apperence and property throughout the whole mixture.
7. horizontal row of elements.
8. gases/unreactive nonmetals.
9. regualr repeating pattern.
11. the starting materials in a chemical reaction.