The Periodic Table

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123456789101112
Across
  1. 4. an element that is a poor conductor of heat and electricity
  2. 8. the smallest particle that has the properties of an element
  3. 9. an electron in the outermost energy level of an atom
  4. 12. a horizontal row of elements in the periodic table
Down
  1. 1. symbol for atomic mass unit
  2. 2. the total number of protons and neutrons in the nucleus of an atom
  3. 3. the process of adding electrons to or removing electrons from an atom or group of atoms
  4. 5. the center of an atom; made up of protons and neutrons
  5. 6. a region in an atom where there is a high probability of finding electrons
  6. 7. an element that is a good conductor of heat and electricity
  7. 10. a negatively charged subatomic particle found in the energy level of an atom
  8. 11. a vertical column of elements in the periodic table