Across
- 4. two atoms with different numbers of isotopes
- 5. mass number the number of protons plus nuetrons ions an atom that carries an electrical charge
- 8. tiny,very light particles, negative electric charge, and moves around the outside of the nucleus
- 9. heavy and large, positive charge, located in nucleus
- 10. any of the possible energies an electron may have in an atom
Down
- 1. indicates number of energy levels
- 2. an electron in the outermost energy level of an atom
- 3. highly reactive, too reactive to be found in nature, good conductors of heat and electricity
- 6. large and heavy, no electrical charge, located in the nucleus
- 7. shares similarities with those in your group and indicates valence electrons