Across
- 3. Number of protons contained in each nucleus
- 6. Electrons that are located in the outermost energy level of an atom
- 10. Single capital letter or a capital letter followed by lower case letter represents element
- 12. Basic unit of a chemical element
Down
- 1. Vertical column on the periodic table
- 2. Smallest unit of a compound that has all of the properties of the compound
- 4. Horizontal row in the periodic table
- 5. An atom that has gained or lost one or more electrons
- 7. Number of protons and neutrons in the nucleus
- 8. Anything that has mass and volume
- 9. describes how likely an element is to form bonds with other elements
- 11. A substance that cannot be broken into a simpler substance