Unit 2 vocabulary

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Across
  1. 3. a particle smaller than an atom
  2. 5. any of a class of substances characterized by high electrical and thermal conductivity
  3. 6. a column of elements in the periodic table of the chemical elements
  4. 8. a substance having a finite activation energy (band gap) for electron conduction
  5. 9. a chemical element is the charge number of an atomic nucleus
  6. 10. The horizontal rows of the periodic table
Down
  1. 1. the total number of protons and neutrons
  2. 2. Atoms with the same number of protons but different numbers of neutrons
  3. 4. electrons are arranged in concentric circular orbits around the nucleus
  4. 7. the mass of an atom of a chemical element expressed in atomic mass units