Across
- 3. big particles that have no electrical charge
- 7. how many protons are in the element
- 8. an electron in the outermost level of an atom
- 10. an atom that carries an electrical charge
Down
- 1. how many electrons the element has
- 2. equal to the number of protons plus neutrons
- 4. average mass of the naturally occurring isotopes of an element
- 5. big particles that have a positive charge
- 6. tiny particles that have a negative electrical charge
- 9. any of the possible energies an electron may have in an atom