atom + periodic

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Across
  1. 3. the amount of electrons allowed in the first shell
  2. 4. I have 20 neutrons and can be found in your teeth and bones
  3. 7. I am not really an alkali metal, but since i have only 1 electron.
  4. 10. outside the nucleus and 1/1840 atomic mass unit
  5. 11. I am a metalloid with 5 protons and 6 neutrons
  6. 12. the amount of electrons allowed in the rest of the shells
  7. 13. substance made of only one type of atom
Down
  1. 1. row that shows the number of shells each element has
  2. 2. the smallest part of an element that retains the property of that element
  3. 4. I am a metal that has 26 protons
  4. 5. contains protons and neutrons
  5. 6. two or more atoms chemically combined
  6. 8. i make up 76% of the air and am found in 5th group
  7. 9. I am a transition metal, my electron configuration is (2,8, 8, 8, 2)