Chemistry Crossword

5. A subatomic particle with a charge of negative electricity
8. The basic unit of a chemical element
9. A supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
11. Lithium, sodium, potassium, rubidium, cesium, and francium are all...
13. The mass of an atom
14. A charge with a +
16. The center of an atom
19. Absorption of heat
22. The property possessed by an object of producing different sensations on the eye as a result of the way the object reflects or emits light
23. A substance formed when two or more elements

1. Combine or become combined chemically with oxygen.
2. A colorless, odorless, highly flammable gas, the chemical element of atomic number 1
3. A substance that does the reaction
4. An element or substance that is not a metal.
6. A very small size
7. Where all the elements are found
10. A charge with a -
12. The medieval forerunner of chemistry, based on the supposed transformation of matter
14. A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
15. Release heat
17. A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen
18. A solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
20. Group 18 of the periodic table.
21. A particle having a non-zero net electrical charge
24. A substance created in a reaction