BI110 Lecture Notes - Lecture 2: Atomic Number, Mass Number

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13 Apr 2018
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Matter: anything that has mass and takes up space, living organisms are made up of matter. Atom: smallest particle of an element that has the properties of that element, each element"s atoms consist of several subatomic particles. Element: pure substance that can"t be broken down into simpler substances by chemical means, refers to a speci c substance, not its component atoms, of the 118 known elements, 92 are produced naturally. Molecule: occur when two or more atoms are combined, can consist of only atoms of the same element (i. e. o2 , molecules consisting of more than one element are called compounds (i. e. co2) There are about 25 elements that are required for proper human functionality. Atomic structure: properties of elements depend on atomic structure, each element is characterized by its number of protons (found in nucleus, nucleus contains neutral particles called neutrons, electrons are negatively charged particles found surrounding nucleus.

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