Across
- 3. an atom with a positive charge
- 5. an atom with a negative charge
- 7. number of protons in a neutral atom
- 8. any of the possible energies an electron may have in an atom
- 10. large and heavy like protons, have no electrical charge, located in nucleus of the atom
- 11. tiny, light particles with an electrical charge.
Down
- 1. an atom the carries an electrical charge
- 2. average mass of the naturally occurring isotopes of an element,
- 4. two atoms with different numbers of neutrons
- 6. an electron in the outermost energy level of an atom
- 9. have a positive charge, located in the ucleus of the atom