Chapter 9 Joe Mitchey

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Across
  1. 2. The mass of an element’s atoms; listed in the periodic table as an average value based on the relative abundance of the element’s isotopes.
  2. 4. In the context of physics, the time required for a vibration or a wave to make one complete cycle. In chemistry, a horizontal row in the periodic table.
  3. 6. An extremely small, negatively charged subatomic particle found in a cloud outside the atomic nucleus.
  4. 7. A positively charged subatomic particle in the atomic nucleus.
  5. 8. Any material that is made up of only one type of atom.
  6. 10. A vertical column in the periodic table; also known as a family of elements.
Down
  1. 1. An abbreviation for an element or atom.
  2. 3. An electrically neutral subatomic particle in the atomic nucleus.
  3. 5. Any member of a set of atoms of the same element whose nuclei contain the same number of protons but different numbers of neutrons.
  4. 9. The dense, positively charged center of every atom.