BSC 108 Chapter Notes - Chapter 1: Subatomic Particle, Radionuclide, Chemical Compound
20 Mar 2017
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Document Summary
Radiation is the most dangerous when exposure is uncontrolled and covers most or all of the body. Matter- anything that occupies space and has mass. Mass- the measure of the amount of material in an object. Element- a substance that cannot be broken down into other substances by chemical reactions. 4 of these elements (oxygen, carbon, hydrogen and nitrogen) make up 96% of the weight of the body. Less than 0. 01 of your weight is made up of 14 trace elements. Trace elements- required in only very small amounts but you cannot live without them. Compounds-substances that contain two or more elements in a fixed ratio. The smallest unit of matter that still retains the properties of an element. Proton- subatomic particle with a single unit of positive electrical charge. Electron- a subatomic particle with a single negative charge. Atomic number- number of protons (which is also the number of electrons in a standard atom)
