SCIENCE

2. the number of protons in the nucleus of an atom,
5. temperature at which the solid and liquid forms of a pure substance can exist in equilibrium.
7. pure substance made of only 1 type of atom that can not be broken down further into other substances
9. consisting of dissimilar or diverse ingredients or constituent
12. liquid changes into a vapor.
13. compound molecules made from a variety of atoms
16. the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.
17. seven horizontal rows of elements
19. food that is not liquid.
21. one of the distinct forms in which matter can exist
23. a stable subatomic particle occurring in all atomic nuclei

1. the elements, arranges the chemical elements into rows and columns
3. the mass of an atom of a chemical element expressed in atomic mass units
4. of the same kind;
6. the membrane-enclosed organelle within a cell that contains the chromosomes
8. compound made up of two or more chemical components that are not chemically linked
10. a stable subatomic particle with a charge of negative electricity
11. a subatomic particle of about the same mass as a proton but without an electric charge
14. able to be dissolved, especially in water.
15. a thing that is composed of two or more separate elements;
18. if its not solid its
20. The vertical columns
22. particle of matter that uniquely defines a chemical element