"Periodicity Crossword": HTML5 Crossword

Across

3. Discovered the Nobel gases single-handedly ! (6)
6. Another word for periods (4)
9. These tend to be more electronegative than the other elements (9)
10. [Ne] 3s2 3p3 (11)
11. The electrons in metals (11)
13. Lanthanides & Actinides Block (11)
16. Block containing the 'staircase' (9)
18. Separates the metals from non-metals (9)
20. Highest melting point in period 3 (7)

Down

1. Columns (6)
2. The state required for ionisation (7)
4. The most common type of element (6)
5. The Russian (9)
7. s for .................... (5)
8. Carbon forms these (14)
12. d for ..................... (7)
14. Has a melting point of 84 K (5)
15. Groups 1 - 4 tend to have these structures (5)
17. Contract across a period (5)
19. The most commonly measured type of radius (8)