Periodic Table Challenge

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Across
  1. 3. number The number of protons in the nucleus of an atom
  2. 5. A negatively charged subatomic particle found in the energy level of an atom
  3. 7. The elements that are usually poor conductors of heat and electricity
  4. 8. law The properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
  5. 10. Another name for group
  6. 12. The center of an atom; made up of protons and neutrons
  7. 13. An ion with a positive charge
  8. 16. The smallest particle that has the properties of an element
  9. 17. Positively charged subatomic particle in the nucleus of an atom
  10. 18. An atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge
  11. 19. number The total number of protons and neutrons in the nucleus of an atom
Down
  1. 1. A vertical column of elements in the periodic table
  2. 2. electron An electron in the outermost energy level of an atom
  3. 4. The process of adding electrons to or removing electrons from an atom or group of atoms
  4. 6. level Any of the possible energies an electron may have in an atom
  5. 8. A horizontal row of elements in the periodic table
  6. 9. A neutral subatomic particle in the nucleus of an atom
  7. 11. The elements that are good conductors of heat and electricity
  8. 14. An ion with a negative charge
  9. 15. Another name for period