Across
- 4. Reactive metals found in group 1
- 10. Has a positive charge
- 13. The max number of electrons that the 2nd and 3rd shell can hold
- 14. A sub-atomic particle with no charge
- 15. Combination of the neutron and proton number
- 17. Has a boiling point of 78 degrees Celsius
- 19. These are found on the periodic table
- 20. The man that was able to prove the existence of the neutron
- 21. Name of the group of gases that have full outer shells
Down
- 1. A method for removing a solid from a solution
- 2. Where electrons are thought to be, some call them 'shells'
- 3. He called his model of the atom the 'plum pudding'
- 5. The same element with different numbers of neutrons
- 6. Reactive non-metals found in group 7
- 7. Put forward the idea of arranging elements in 'octaves'
- 8. A type of reaction where a more reactive element swaps places with a less reactive one
- 9. A method for removing insoluble particles from a liquid
- 11. The centre of an atom made up of positive and neutral particles
- 12. The man that demonstrated the electrons are arranged in energy levels (shells)
- 16. Proposed the periodic table we use today
- 17. A sub-atomic particle with a negative charge
- 18. The Greeks thought that this is the smallest unit of matter