BSC 2010C Study Guide - Quiz Guide: Chemical Polarity, Electron Shell, Mass Number
Document Summary
Word roots: an- = not co- = together electro- = electricity iso- - equal neutr- = neither pro- = before. Matter is anything that takes up space and has mass. It is comprised of elements which may be individual or combined in various ratios to form compounds or molecules. An element is something that can not be further broken down by just typical chemical reactions so once you go below the level of matter, you are dealing with subatomic particles. Most living organisms are made of just four: carbon, hydrogen, oxygen and nitrogen. The atom can be broken into 3 main parts: Protons, found in atomic nucleus, positively charged. Neutrons, found in atomic nucleus, electrically neutral. Electron, found surrounding atomic nucleus in series of electron shells, negatively charged. Atomic number = number of protons in an atom. Also number of electrons in neutral atom. Each element has a unique atomic number.