"Periodicity Crossword": HTML5 Crossword

Across

3. Highest melting point in period 3 (7)
5. Contract across a period (5)
7. The most common type of element (6)
9. These tend to be more electronegative than the other elements (9)
10. s for .................... (5)
11. Lanthanides & Actinides Block (11)
14. Another word for periods (4)
17. The electrons in metals (11)
18. [Ne] 3s2 3p3 (11)
19. Separates the metals from non-metals (9)

Down

1. Discovered the Nobel gases single-handedly ! (6)
2. Groups 1 - 4 tend to have these structures (5)
4. The most commonly measured type of radius (8)
6. d for ..................... (7)
8. Carbon forms these (14)
12. Columns (6)
13. Block containing the 'staircase' (9)
15. The state required for ionisation (7)
16. The Russian (9)
20. Has a melting point of 84 K (5)