Across
- 1. Also known as families; columns of the periodic table that contain elements with similar characteristics
- 5. Rows of the periodic table containing a series of different elements
- 7. Contain ether one or two letters that is often an abbreviation of an element's name in English
- 8. Number of protons in the nucleus of an element
- 9. Particles that have no charge
- 10. Positively charged particles
Down
- 2. An arrangement of elements showing the repeating pattern of their properties
- 3. The average mass of all the isotopes of that element
- 4. the very center of an atom containing protons and neutrons
- 6. Negatively charged particles moving around the space outside the nucleus