Matters

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Across
  1. 5. the smallest unit to make up all kinds of matters
  2. 7. negative ion
  3. 8. on the right side in the Periodic table
  4. 9. a subatomic particle which carries no charge
  5. 10. the sum of the number of protons and neutrons
  6. 12. a pure substance that is made up of 2 or more types of atoms chemically combined together
  7. 13. consists of 2 or more elements or compounds which can be separated in physical ways
  8. 14. has mass and occupies space
  9. 15. the lightest subatomic particle
Down
  1. 1. on the left side in the Periodic table
  2. 2. a subatomic particle which carries positive charge
  3. 3. the same as the number of protons, unique to every single element
  4. 4. an atom or a molecule has an electrical charge
  5. 6. positive ion
  6. 7. the smallest unit to make up an element
  7. 9. the mass centre in an atom
  8. 11. a pure substance that is only made up of 1 type of atoms
  9. 13. has properties of both metal and non-metal
  10. 14. a particle which is made up of 2 or more different types of atoms