Atom and Periodic Table

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Across
  1. 3. A _______________ is a vertical column on The
  2. 4. Atom with same number of protons and
  3. 6. #6 on The Periodic Table of the Elements.
  4. 8. This scientist created the atomic theory.
  5. 10. To find the number of __________: Subtract the atomic number from the atomic mass.
  6. 12. Table of the Elements
  7. 13. Atoms which loses(s) electron(s) are known as __________.
  8. 16. atoms always have the same number of
  9. 17. Atoms are arranged on The Periodic Table of the _____________.
  10. 19. organic compounds consisting entirely of hydrogen and carbon.
  11. 20. Metals are considered this if they can be made into sheets.
  12. 22. These are good conductors of heat and electricity. They also have luster and a high density.
Down
  1. 1. This particle has no charge and is found within the nucleus of an atom.
  2. 2. Metals are considered this if they can be made into wire.
  3. 5. and electrons, this called the
  4. 7. but different numbers of neutrons.
  5. 9. These types of metals are found in the middle of the Periodic Table.
  6. 11. The positively charged dense center of an
  7. 14. Abbreviation for Atomic Mass Units.
  8. 15. Atoms which gain(s) electron(s) are known as __________.
  9. 18. Electron’s in the outer most shell. _______________ shell.
  10. 21. These have properties of both metals and nonmetals.