PHYSICAL SCIENCE 8

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Across
  1. 3. pure substance made of only 1 type of atom that can not be broken down further into other substances.
  2. 6. collection of elements
  3. 7. are called PERIODS and the columns are called GROUPS.
  4. 9. chemical element with symbol O and atomic number 8.
  5. 10. separates the interior of the cell from the outside environment.
  6. 11. the basic unit of a chemical element.
  7. 13. a subatomic particle with a positive electric charge.
Down
  1. 1. of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
  2. 2. A small particle with a negative charge that is found in all atoms.
  3. 4. a substance made from two or more different elements that have been chemically joined.
  4. 5. a particle with a neutral charge
  5. 8. type of chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals.
  6. 12. a column in the periodic table of the chemical elements.