Across
- 3. a reaction that takes in energy
- 6. the substance of the result of a chemical reaction
- 8. a name given to a horizontal row of elements on the periodic table
- 9. a example is helium
- 10. a potential pattern of electron density that are formed in an atom
- 11. a Russian chemist they created a periodic table and predicted the discovery of seven new elements
- 12. a thin layer of this put on another piece of metal
- 15. a substance made of of atom that all have the same number of protons
- 16. states that mass is neither destroyed or created during a reaction
- 20. a two lettered short way to say an element
- 22. a subatomic particle with a negative charge
- 24. the positive charge in an atom
Down
- 1. a element in between a metal and a nonmetal
- 2. the number of protons in a nucleus in the atom
- 4. the core of an atom
- 5. the outer shell of an atom
- 7. mass of a atom in a chemical element
- 13. a "family" of element in the periodic table
- 14. the smallest constituent unit of ordinary matter
- 17. a reaction that releases energy
- 18. a chemical element that lacks metallic attributes
- 19. a group of atoms bonded together
- 21. a good conductor of electricity
- 23. a subatomic particle that has no net electric charge