Chemistry Crossword

2. 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
4. A colorless, odorless, highly flammable gas, the chemical element of atomic number 1
6. A solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
8. The center of an atom
10. The medieval forerunner of chemistry, based on the supposed transformation of matter
11. Release heat
13. A very small size
15. A charge with a +
16. Absorption of heat
18. Where all the elements are found
20. A subatomic particle with a charge of negative electricity
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. Group 18 of the periodic table.
24. Combine or become combined chemically with oxygen.

1. A substance that does the reaction
3. An element or substance that is not a metal.
5. The basic unit of a chemical element
7. Lithium, sodium, potassium, rubidium, cesium, and francium are all...
9. A charge with a -
12. A substance formed when two or more elements
14. A substance created in a reaction
17. A supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
19. The mass of an atom
21. 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.
25. A particle having a non-zero net electrical charge