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