Periodic table

2. - As 33
4. - B 5
6. - Sb 51
8. - Cu 29
9. - relating to an atom/s
10. - Ar 18
11. - I 53
13. - O 8
17. - U 92
18. - involving or resulting from a reaction between two or more substances
20. - Cl 17
21. - a particle of matter that uniquely defines a chemical element
22. - any substance that cannot be decomposed into simpler substances by ordinary chemical processes

1. - Br 35
3. - a positive charge
5. - a table of the chemical elements arranged in order of atomic number
6. - the number of protons in the nucleus of an atom
7. - Fe 26
10. - the mass of an atom of a chemical element expressed in atomic mass units
12. - a negative charge
14. - a neutral charge
15. - Li 3
16. - Hg 80
19. - He 2