Chap 2 & 4

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Across
  1. 2. An atom that became charged by losing or gaining some electrons
  2. 6. Horizontal collection of elements in the periodic table
  3. 7. All the numbers of the measurement, estimated digit included, are known as (two words)
  4. 10. Two ___________ of the same element are identical - except that they have different number of neutrons
  5. 11. Mass divided by volume
Down
  1. 1. Counts the protons and neutrons in the atom, useful to distinguish between isotopes of the same element (two words)
  2. 3. The ____________ gases in group 8A are too “high and mighty” to bond with other elements
  3. 4. The weighted average mass of an atom of the element (two words)
  4. 5. Counts the protons in the atom, used to distinguish between atoms of different elements (two words)
  5. 8. The positively charged, densest, part of the atom; Discovered by Rutherford
  6. 9. The periodic table mainly consists of elements known as __________ which tend to lose electrons in chemical reactions