Unit B crossword

5. a horizontal row in the periodic table
8. changing a solid to a gas directly
10. compound when non metals combine to form a pure substance
12. changing from liquid to gas
15. reaction a chemical reaction that absorbs heat and feels cold
17. compound are substances formed as a result of the attraction between particles of opposite charges, called ions.
19. gases The most stable and nonreactive elements
20. symbol abbreviation for the element name
21. can be solid or gas, and doesn't conduct electricity
23. number the sum of a number of neutrons and protons in an atom.
24. are shiny malleable and ductile

1. the smallest component of an element having the chemical properties of the element
2. neutral particles
3. changing from a gas to a liquid
4. gas changing directly into a solid
6. reaction when two or more substance combine to form a new substance
7. reaction a chemical reaction that produces heat
9. group 17 elements that are the most reactive nonmetals
11. a subatomic particle with a charge of negative electricity
13. new materials produced when mixing to reactants
14. are characteristics that can define or describe a substance
16. the charge of an atom or molecule
18. Workplace hazardous materials information system
22. have both metallic and nonmetallic properties