Across
- 4. An atom that carries an electrical charge.
- 6. Any of the possible energies an electron may have in an atom.
- 7. Located in the nucleus of the atom; no charge.
- 9. Move around the outside of the nucleus; negative charge.
- 10. Two atom with a different number of neutrons.
Down
- 1. Highly reactive elements on the periodic table of elements.
- 2. Designer of the periodic table of elements.
- 3. An electron in the outermost energy level of an atom.
- 5. Located in the nucleus of the atom; positive charge.
- 8. Used for things that are too small or too large to be observed.