Periodic table

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Across

2. has five
4. has fourteen
7. has nineteen
8. has seventeen
9. has eleven
11. has four
12. has eighteen
13. has two protons
14. has one proton
15. has twelve
18. has nine

Down

1. has six
3. has twenty
5. has three
6. has seven
7. has fifteen
10. has thirteen
16. has sixteen
17. has ten
19. has eight