Chapter 2 outline - ELEMENT: A substance that cannot be...

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Unformatted text preview: ELEMENT: A substance that cannot be broken down to into other substances by chemical reactions There are 92 recognized elements that occur in nature About 25 elements are required for life COMPOUND : A substance consisting of 2 or more elements in a fixed ratio A compound has characteristics beyond those of its combined elements Elements vs. Compounds Trace Elements Elements required by an organism only in minute quantities EX: Iron ATOM: The smallest unit of matter that still retains the properties of an element SUBATOMIC PARTICLES: Neutrons (neutral charge) Protons (positive charge) Electrons (negative charge) In electron cloud outside the nucleus AMU: Atomic Mass Unit A unit of measurement for atoms and subatomic particles Named after John Dalton (atomic theory 1800) Atomic # and Atomic Weight Atomic Number: Refers to the number of protons an element has, which is unique to each element Mass Number: The sum of protons and neutrons in the nucleus of an atom Atomic Weight: The approximation of the total mass of an atom (same as mass number) Isotopes...
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Chapter 2 outline - ELEMENT: A substance that cannot be...

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