Atoms

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 3. That which has mass and occupies space (6)
  2. 6. A stable particle with positive charge equal to the negative charge of an electron (plural) (7)
  3. 8. A particle that is electrically charged (plural) (4)
  4. 10. The order of an element in Mendeleyev's table of the elements (12)
  5. 11. An elementary particle with negative charge (plural) (9)
  6. 12. One of two or more atoms with the same atomic number but with different numbers of neutrons (plural) (8)
  7. 13. English chemist and physicist who formulated atomic theory and the law of partial pressures (6)

Down

  1. 1. United States classical archaeologist noted for leading the excavation of the Athenian agora (8)
  2. 2. The sum of the ___ of neutrons and protons in an atomic nucleus (10)
  3. 4. An elementary particle with 0 charge and mass about equal to a proton (plural) (8)
  4. 5. The smallest component of an element having the chemical properties of the element (plural) (5)
  5. 7. A unit strength of a radioactive source equal to one million disintegrations per second (10)
  6. 9. Center of an atom or a cell (7)