Atoms+and+Molecules


 * Video**: [|Atoms and Molecules]

The Nature of Molecules 

[|Matter]
Matter is defined as anything that has [|mass] (an amount of matter in an object) and occupies [|space] (which is measured as [|volume]).  = [|The atom] =
 * Particles, from smallest to largest
 * 1) Subatomic particles
 * [|Electrons]
 * [|Protons]
 * [|Neutrons]
 * 1) Atoms
 * 2) Molecules
 * 3) Macromolecules
 * Origin of matter
 * 1) [|Big Bang], about 13.7 billion years ago
 * 2) [|Hydrogen], [|helium]
 * 3) Heavier elements formed in suns, super nova
 * Earth's matter predates formation of sun, 4.5 billion years ago
 * All matter consists of atoms, which are composed of : electrons, protons, neutrons
 * Example: Hydrogen
 * The simplest element
 * One proton (+)
 * One electron in orbit (-)
 * Built by adding one proton (and one electron) at a time
 * Number of protons determines atomic number and number of electrons
 * Neutrons
 * Neutral charge
 * Contribute mass
 * May decay
 * [|Oxygen]
 * 8 protons (mass)
 * 8 electrons
 * 8 neutrons (mass)