Across
- 2. found in the nucleus of every atom
- 6. negatively charged particle bound to an atom or free
- 8. an element that's in between a metal and non-metal
- 9. the group contains He,Ne,Ar,Xe,Rn,Og
Down
- 1. 6 of the non-metallic elements
- 3. positively charged core of an atom
- 4. the classification for a number of protons in the nucleus of an atom
- 5. the average weight of an atom
- 7. particle of a matter that uniquely defines an element
- 8. classification for Fe, and other similar elements