ATOMS AND MOLECULES

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Across
  1. 1. centre of an atom.
  2. 4. It is the chemical formula of calcium oxide.
  3. 5. made of two or more atoms.
  4. 7. the combining capacity of an element.
  5. 10. a charge of the atom.
  6. 11. number of atoms in oxygen molecules.
  7. 13. the basic unit of matter
  8. 14. negatively charged ion.
Down
  1. 2. an element with an atomic mass of 35.5.
  2. 3. used to represent the element.
  3. 6. positively charged ions.
  4. 8. an element whose symbol is Co.
  5. 9. particles in the atom with no charge.
  6. 12. charged particles.
  7. 13. molecules of ____ are constituted by one type of atom.