Across
- 4. Two atoms with different numbers of neutrons are called _______.
- 5. equal to the number of protons plus neutrons.
- 7. Large and heavy like protons Neutrons have no electrical charge Located in the nucleus of the atom
- 8. An atom that carries an electrical charge is called an _______.
- 9. average mass of the naturally occurring isotopes of an element
- 10. any of the possible energies an electron may have in an atom.
Down
- 1. an electron in the outermost energy level of an atom.
- 2. Much larger and heavier than electrons Protons have a positive charge (+) Located in the nucleus of the atom
- 3. Tiny, very light particles Have a negative electrical charge (-) Move around the outside of the nucleus
- 6. number of protons In a neutral atom, the # of protons = the # of electrons