BIOL 186 Study Guide - Midterm Guide: Subatomic Particle, Atomic Nucleus, Atomic Number
31 Mar 2018
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Element: substance that cannot be broken down to other substances by chemical reactions - examples: gold, silver, carbon and oxygen. Compound: a substance consisting of two or more di erent elements combined in a. A compound has characteristics di erent from those of its elements. Of the 92 natural elements, 20-25% are essential elements. Essential elements: natural elements that organisms need to live a healthy life and reproduce. Humans (25) including: oxygen, carbon, hydrogen, nitrogen, calcium, phosphorus, potassium, sulphur, sodium, chloride, magnesium. Some natural elements are toxic to humans - arsenic coming from ground water wells linked to disease. Atom: the smallest unit of matter that retains the properties of an element. C: stands for both the element carbon and a single carbon atom. Subatomic particles: smaller than the atom, composed of even smaller parts. Neutrons: subatomic particle with no electrical charge - neutral. Protons: a subatomic particle with a single positive electrical charge.
