Across
- 2. negatively charged ion
- 3. it has atomic mass 23u
- 6. anything that has mass and occupies space
- 8. unit used to measure mass of an atom
- 11. having one shell which is complete
- 12. charge on an atom
- 13. has two valencies one and two
- 15. cation with valency three
- 17. combining capacity of an element
- 18. short hand representation for an element
Down
- 1. silver colour ribbon
- 4. same atomic number different atomic mass
- 5. molecule which contains three atoms
- 7. having two shell with seven valence electrons
- 9. it's atomic number is 15
- 10. symbol is Sn
- 14. group of atoms having a common charge
- 16. neutral particle in the centre of an atom