Across
- 2. sub-atomic particle with a positive charge
- 3. particle that is smaller than an atom
- 4. pure substance made of atoms of same # of protons
- 6. the smallest unit of matter that forms an element
- 8. column on the periodic table
- 9. row on the periodic table
- 10. sub-atomic particle with a negative charge based on ratio of protons and neutrons
- 12. the horizontal segment in a table
- 13. the vertical segment in a table
Down
- 1. matter composed of atoms
- 5. elements with similar chemical properties
- 7. small dense center of an atom
- 9. table including all known elements
- 11. sub-ataomic particle with a neutral charge