periodic table

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Across
  1. 1. A chemical bond formed when atoms share three pairs of electrons
  2. 4. Particles of no charge located in the nucleus of an atom
  3. 6. The central part of the atom when protons and neutrons are located
  4. 7. The smallest particle of a compound that retains all the properties of the compound and its composed of one or more atoms
  5. 8. A table that shows the elements,the atomic number,symbol,and average atomic mass;elements with similar chemical properties grouped together
  6. 12. A charged atom due to the loss or gain of negative electrons
  7. 13. A chemical bond when atoms share two parts of an electron
  8. 14. A pure substance made of only one kind of atom
  9. 15. A chemical bond formed when atoms share two pairs of electrons
Down
  1. 2. Created in an atom when it has more protons then electrons
  2. 3. The possible locations around a nucleus where electrons may be found
  3. 5. A chemical bond formed when atoms share one pair of electrons
  4. 8. Positively charged particles located in the nucleus of an atom
  5. 9. Atoms of the same elements that have different numbers of neutrons
  6. 10. The number of protons in the nucleus of an atom
  7. 11. The average mass of all the isotopes of an element