Unit B crossword

3. compound when non metals combine to form a pure substance
6. are characteristics that can define or describe a substance
10. gases The most stable and nonreactive elements
12. group 17 elements that are the most reactive nonmetals
14. new materials produced when mixing to reactants
16. changing from a gas to a liquid
17. can be solid or gas, and doesn't conduct electricity
20. have both metallic and nonmetallic properties
22. gas changing directly into a solid
23. reaction when two or more substance combine to form a new substance
24. compound are substances formed as a result of the attraction between particles of opposite charges, called ions.

1. the smallest component of an element having the chemical properties of the element
2. changing a solid to a gas directly
4. a horizontal row in the periodic table
5. number the sum of a number of neutrons and protons in an atom.
7. reaction a chemical reaction that produces heat
8. neutral particles
9. changing from liquid to gas
11. reaction a chemical reaction that absorbs heat and feels cold
13. the charge of an atom or molecule
15. a subatomic particle with a charge of negative electricity
18. are shiny malleable and ductile
19. symbol abbreviation for the element name
21. Workplace hazardous materials information system