Chemistry Basics

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Across
  1. 3. The smallest unit of an element that retains its chemical identity.
  2. 7. The type of table used to organize all known elements. (Answer: PERIODIC)
  3. 10. A process in which substances are rearranged to form new substances.
  4. 12. Anything that has mass and occupies space.
  5. 13. A pure substance made of only one type of atom.
  6. 14. Neutral particle located in an atom's nucleus.
  7. 15. The ratio of mass to volume used to identify substances.
Down
  1. 1. A measure of the amount of matter in an object.
  2. 2. Law stating that mass is neither created nor destroyed during a chemical reaction.
  3. 4. Dense center of an atom containing protons and neutrons.
  4. 5. A physical combination of substances that can be separated without chemical change.
  5. 6. Negatively charged particle found outside the nucleus.
  6. 8. Two or more atoms held together by covalent bonds.
  7. 9. Positively charged particle found in the nucleus.
  8. 11. A substance formed when two or more elements are chemically bonded in fixed ratios.