Chemistry crossword

1. the sum of the number of protons and neutrons in a atom
4. the most reactive of the metals
6. shiny, malleable and ductile element that conducts electricity
8. a pure substance formed when non-metals combine
12. is the mass of one atom of an element
14. A change in which the appearance or state of a substance that does not change composition.
17. Chemical combination of two or more elements in a specific ratio.
18. Substance made of only one kind of matter, which has a unique set of properties.
20. element that has both metallic and non-metallic properties
21. Characteristics that describe a particular substance.
23. a change of stae from a solid to a liquid
24. Pure substance that can not be broken down into other substances.

1. The point at which temperature a substance will begin to melt at.
2. a combination of symbols that represent a compound
3. a fundamental principal that energy cannot be created or destroyed
5. A table in which the elements are organized by there physical and chemical properties.
7. Ability of a substance to conduct electricity or heat.
9. A change that results when two or more substances react to create a different substance.
10. Substance that helps a chemical reaction to proceed more quickly.
11. Description of a substance that can be pounded or rolled into sheets.
13. Anything that has a mass and occupies space.
15. Mass of a substance that can dissolve in a given amount of solvent.
16. Description of a solid that can be stretched into a long wire.
19. The point at which temperature a substance will begin to boil at.
22. a substance that strongly resists the flow of electricity