Matter Intro Chapter

Anything that has mass and volume. Matter

The smallest unit of an element that keeps the properties of that element. Atom

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

Contains the protons and neutrons. Nucleus

Proton Found in the nucleus with a positive charge. +

Found in the nucleus with a neutral charge. Neutron n

Found orbiting outside the nucleus with a negative charge. - Electron

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

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

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

Atomic # Element Name Chemical Symbol Atomic Mass Periodic Table

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

Atomic Mass

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

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