Across
- 3. / 6.02 x10 to the power of 23
- 4. / basic unit of matter
- 8. / an atom of an element with a different number of neutrons
- 9. / the _____ number corresponds to the number of electrons in an atom
- 10. / positively charged particle
- 11. / negatively charged particle
- 12. / the periodic table is divided into columns called
Down
- 1. / particles with no charge
- 2. / the electrons in the outermost shell of an atom
- 3. / creator of the periodic classification of elements
- 5. / the periodic table is divided into columns called
- 6. / elements which display characteristics of both metals and non metals
- 7. / the periodic table is divided into rows called