Across
- 2. equivalent to the number of protons and neutrons in an element
- 4. formed by atoms or molecules by one or more electrons
- 5. short representation of a chemical element
- 8. determines chemical properties and place(on P.T) of an element
- 9. process accompanied by the absorption of heat
- 11. a thin coating of gold, silver, or another metal
- 12. horizontal rows on the periodic table
- 17. examples: helium, radon, xenon, krypton, neon, and argon
- 18. substances consumed during the reaction to make product
- 19. chemical element with properties in between those of metals and nonmetals
- 20. basic unit of a chemical element
- 21. electrons on the outside rings
- 23. consists of several parts, or elements in particular
- 26. on the periodic table there are 18 of these
Down
- 1. principle in any closed system subjected to no external forces, mass is irrespective of changes in form
- 3. particle with a negative charge
- 6. element of substance that does not conduct electricity
- 7. particle with no charge
- 10. conductors of electricity, have crystalline solids with a metallic luster, and have a high chemical reativity
- 13. developed periodic table and predicted discovery of several new elements
- 14. group of atoms bonded together
- 15. process accompanied by the release of heat
- 16. particle with a positive charge
- 22. distinguished by its atomic number
- 24. species formed from chemical reactions
- 25. central core of an atom