Across
- 2. horizontal row of elements in the periodic table
- 5. the noble gas used in light bulbs
- 8. an alkali metal with 19 electrons
- 10. the only metal which is liquid at room temp
- 11. atoms of the same element with different mass numbers
- 12. the positively charged particle in an atom
Down
- 1. an element with no neutrons
- 3. reactions that give out alot of heat
- 4. the other name for group 7
- 6. vertical row of elements in the periodic table
- 7. where electrons are found in an atom
- 9. a fossil fuel