Periodic table

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Across
  1. 3. has only one energy level
  2. 6. Electrons per shell: 2, 8, 14, 2
  3. 7. silvery-white metal
  4. 9. atomic mass of 75
  5. 10. attic number 18
Down
  1. 1. atomic number 107
  2. 2. atomic weight of 127
  3. 4. very hard, and very resistant to heat
  4. 5. has 14 neutrons
  5. 8. Electron Configurations 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6