Across
- 5. The way electrons are arranged in the shells
- 7. When a single compound breaks down into two simpler
- 13. Defines a materials
- 16. 1800 times smaller in mass than protons and neutrons
- 17. Opposite of acid,it likes to receive hydrogen ions
- 21. The weight of an atom
- 22. Have a positive charge
- 25. A row in the periodic table
Down
- 1. One that cannot be broken down into another substance
- 2. Proposed the photoelectric effect
- 3. Discovered the neutron
- 4. Table in which all known elements are represented
- 6. Russian chemist
- 8. An example of oxidation
- 9. of hydrogen. The scale in which acids and bases are measured
- 10. Smallest indivisible form a chemical particle
- 11. Liquid that produces positive charged hydrogen ions
- 12. Two or more substances combine
- 14. The burning of a substance in oxygen
- 15. Elements created by scientists
- 18. The number of protons in the nucleus
- 19. The measure of an atom’s ability to attract a pair of electrons
- 20. Not a element
- 23. A column in the periodic table
- 24. Have no electrical charge