Across
- 4. A grey, brittle alkaline earth metal with valency 2
- 7. a diatomic molecule, with a valency of 1
- 9. highest melting point, can be found mainly in 2 forms with a valency of 4.
- 12. colourless and odourless gas, 21% of it is in the air
- 13. Non-metal with atomic size 188pm and valency 0
- 14. A yellow-green gas at room temperature
- 16. A tasteless yellow solid with the 4th highest metallic character
- 18. The most widely used non ferrous metal
- 21. A noble gas used for filling balloons and dirigibles
Down
- 1. Element present in glass and used as a semiconductor
- 2. I appear in as the last number in an electronic configuration
- 3. Most reactive non metal
- 5. Element of low metallic character in group 15, makes up 1% of a persons total body weight
- 6. Metal with valency 1 has a Latin name Kalium
- 8. Inert Gas used for lighting
- 10. a silvery white material, also found in our bones and teeth
- 11. A silvery white element with valency 2 that is highly resistant to corrosion
- 15. The highest purity of which exists as an amorphous dark brown to black powder
- 17. Period 3 metalloid
- 19. Element with high metallic character belonging from the 1st group and second period
- 20. Metal with atomic size 227pm has the Latin name Natrium