1. Matter Intro Chapter

2. Anything that has mass and volume. It is made up of atoms. Matter

3. The smallest unit of an element that retains (keeps) the properties of that element. –Made up of a subatomic particles Atom

4. Small particles of the atom –Nucleus Protons ( + ) Neutrons (neutral charge) –Electron Cloud Electrons ( - ) Subatomic Particles

5. The part of the atom that contains the protons and neutrons. Nucleus

6. Proton A subatomic particle found in the nucleus of an atom with a positive charge. +

7. A subatomic particle found in the nucleus of an atom that has a neutral charge. Neutron n

8. Subatomic particle found orbiting in the electron cloud outside the nucleus that has a negative charge. - Electron

9. Element A substance composed of a single kind of atom. –Hydrogen –Helium –Carbon –Nitrogen –Oxygen –Neon –Sodium –Magnesium –Aluminum –Silicon –Argon –Calcium –Iron –Gold H He C N O Ne Na Mg Al Si Ar Ca Fe Au

10. Elements Each element is identified by it’s atomic number. Atomic #

11. A diagram showing the arrangement of the elements according to their atomic numbers so that elements with similar properties are in the same column. Periodic Table

12. Atomic # Element Name Chemical Symbol Atomic Mass Periodic Table

13. Atomic Mass Atomic # Atomic Mass # Protons = Atomic Number # Neutrons = Atomic Mass- Atomic Number # Electrons = Atomic Number

14. Atomic Mass

19. Compound A substance in which two or more elements are chemically combined.

20. Mixture Two or more substances that are mixed together but not chemically combined.