Across
- 2. are molecules of at least two different elements
- 7. shows the #of molecules
- 10. has no value
- 11. Electrons in the last cell
- 12. A group of electrons circulating around a nucleus or a molecule
Down
- 1. shows the amount of atoms
- 3. is the measurement of how tightly a material is packed together
- 4. is located in the nucleus with the neutron
- 5. is the smallest unit of an element
- 6. not located in the nucleus
- 8. example(hydrogen)
- 9. atomic number + # of proton + # of electron & Atomic Mass- Atomic # = # of Neutrons