periodic table

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Across
  1. 2. A chemical bond formed when atoms share one pair of electrons
  2. 5. A chemical bond formed when atoms share three pairs of electrons
  3. 7. Created in an atom when it has more protons than electrons
  4. 9. The smallest part of an element
  5. 10. A pure substance made of only one kind of atom
  6. 11. Electrons on the outermost energy level of an atom
Down
  1. 1. Created in an atom when it has more electrons than protons
  2. 3. A chemical bond formed when atom share two pairs of electrons
  3. 4. Positively charged particles located in the nucleus of an atom
  4. 6. A chemical bond formed when atoms share electron
  5. 8. A charged atom due to loss or gain of negative electrons
  6. 9. The number of protons in the nucleus of an atom
  7. 12. The average mass of all the isotopes of an element