Chemistry: Periodic Table
Across
- 3. found in the nucleus and has a neutral charge
- 7. tendency for a chemical substance to undergo a chemical reaction
- 8. where electrons are found
- 11. the center of an atom where protons and neutrons may be found
- 12. a positive subatomic particle
- 13. negatively charged particle
- 15. the smallest particle of an element with all the properties of that element
- 16. a model of an atom where electrons travel in circular pathways around the nucleus
- 17. zero charge
- 19. a property of a substance that cannot be observed without changing the identity of the substance
Down
- 1. the number of protons in the atom
- 2. a property of a substance that can be observed without changing the identity of the substance
- 4. a table organizing all the known elements based on electron shells, the number of valence electrons, and the number of protons
- 5. electrons in the outermost shell
- 6. a column on the periodic table
- 9. a pure substance made of only one type of atom
- 10. the father of the periodic table
- 14. the combined mass of the protons and the neutrons of an atom
- 18. a row on the periodic table