Measurements and Atoms and Elements

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Across
  1. 3. The densest part of the atom; Always positive
  2. 7. The elements in the two leftmost columns and six rightmost columns of the periodic table are known as _______ elements
  3. 9. An atom that became charged by losing or gaining some electrons
  4. 10. Two ___________ of the same element are identical in every way except the number of neutrons in the nucleus
  5. 11. The _________ number is used to distinguish between elements. It counts the number of protons in the atom
  6. 12. The periodic table is dominated by ______. They tend to lose electrons in chemical reactions
Down
  1. 1. Members of group 7A
  2. 2. These elements (e.g., helium and neon)on the right edge of the periodic table are "too comfortable on their own" so they don't make compounds. They are known as _______ gases
  3. 4. All the numbers of the measurement, estimated digit included, are known as ____________ figures
  4. 5. Horizontal collection of elements in the periodic table
  5. 6. The weighted average mass of an atom of the element (two words)
  6. 8. Mass divided by volume
  7. 12. The ___________ number counts the protons and neutrons in the atom