Across
- 1. =number of protons+neutrons
- 6. an electron in the outside shell of an atom
- 7. =periods
- 9. orbit around the nucleus, negative charge
- 11. positive charge, located in the nucleus
Down
- 1. =number of protons
- 2. designer of the periodic table
- 3. no electric charge, located in the nucleus
- 4. most important table in science
- 5. normal,# of protons and neutrons does not change
- 8. 2 atoms with a different # of neutrons but the same protons
- 10. =groups