Chemistry Vocabulary

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Across
  1. 3. Electrons in the outermost shell of an atom
  2. 4. Elements that have the same atomic number but different number of neutrons
  3. 6. The heaviest part of an atom
  4. 10. The base unit of amount of a substance as determined by the International System of Units
  5. 12. The least reactive group on the periodic table
  6. 15. The part of the atom with a positive charge
  7. 16. Where the protons and neutrons are found in a atom
Down
  1. 1. The study of substances and their behaviors
  2. 2. The smallest part of an atom
  3. 5. An atom that has lost or gained one or more electrons
  4. 7. Substance used to cause a chemical reaction
  5. 8. The smallest unit of matter that forms an element
  6. 9. A substance made of atoms that all have the same number of protons
  7. 11. The most reactive group of metals on the periodic table
  8. 13. A substance composed of two or more chemical elements
  9. 14. The results of a chemical reaction