elements

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Across
  1. 4. only element that does not solidify under ordinary pressures
  2. 7. a table of the chemical elements arranged in order of atomic number
  3. 8. The lightest subatomic particle known
Down
  1. 1. outer layer of a bohr model
  2. 2. building block of chemistry
  3. 3. Forms of an element with the same number of protons but different numbers of neutrons
  4. 5. Forms of an element which have an electrical charge
  5. 6. A positively-charged particle
  6. 9. no electrical charge