Across
- 5. there are 18 of these on the periodic table
- 6. Can be a metal, not-metal or transition
- 8. tells you how many elements are in a molecule
- 9. are placed on energy level in an atom
- 11. A property that is observed with senses
- 12. Made of two or more elements chemically combined
Down
- 1. A substance that cannot be separated into smaller parts
- 2. A change where a new substance is formed
- 3. the centre of an atom
- 4. one of these of an element is represented by a symbol
- 7. there are 7 of these on the periodic table
- 10. number is calculated by subtracting atomic number from atomic mass
- 11. equal to the atomic number