periodic table

4. how much "stuff" (mass) is packed into a certain amount of space (volume)
6. the amount of force exerted per unit area of a surface
7. a group of atoms that are held together by chemical forces; a molecule is the smallest unit of a compound that keeps all the properties of that compound
10. a form of matter that does not have a definite volume or shape
12. a measure of the amount of matter in an object
14. anything that has mass and takes up space
15. the total kinetic energy of a substance's particles
16. the state of matter that has a definite volume but not a definite shape
17. a substance made up of atoms of two or more different elements joined by chemical bonds
18. the smallest unit of an element that maintains the properties of that element

1. a sample of matter, either a single element or a single compound, that has definite chemical and physical properties
2. the change of a substance from one physical state to another
3. a substance that cannot be separated or broken down into simpler substances by chemical means
5. a system for arranging the chemical elements
8. the amount of space that an object takes up, or occupies
9. a measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particles in an object
11. the attractive force that holds atoms, ions, or molecules together, formed by the redistribution of valence electrons (outer shell electrons) to achieve a more stable, lower-energy state
13. a state of matter that holds a definite shape and volume