Science Crossword

3. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids
6. The vertical columns on the periodic table
8. a substance made by mixing other substances together
10. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table
11. firm and stable in shape, not liquid or fluid
12. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass
14. a substance or matter in a state in which it will expand freely to fill the whole of a container
16. able to be dissolved, especially in water
17. the horizontal rows of the periodic table
18. of the same kind, alike
20. the temperature at which a given solid will melt
21. one of the distinct forms in which matter can exist
22. relating to or denoting electrons involved in or available for chemical bond formation

1. the temperature at which a liquid boils and turns to vapor
2. the organized array of all chemical elements in order of increasing atomic number
4. a thing that is composed of two or more separate elements
5. the basic unit of a chemical reaction
7. occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign
9. consisting of dissimilar or diverse ingredients or constituents
13. a substance that flows freely but is of constant volume
15. each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter
17. 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
19. the mass of an atom of a chemical element expressed in atomic mass units