BIOLOGY 1113H Chapter Notes - Chapter 2: Radioactive Decay, Half-Life, Covalent Bond

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2-1| matter consists of chemical elements in pure form and in combinations called compounds. Matter: anything that takes up space and has mass. Elements: a substance that cannot be broken down into other substances by chemical reactions. Compound: substance consisting of two or more elements combined in a fixed ratio. Essential elements: elements an organism needs to live a healthy life and reproduce. Four elements (o, n, c, and h) make up 96% of living matter. P, k, ca, s, and a few others account for remaining 4% Trace elements: elements required by organisms in only small quantities (such as iodine) 2-2| an element"s properties depends on the structure of its atoms. Atom: the smallest unit of matter that still retains the properties of an element. Atomic nucleus: protons and neutrons packed densely together. Dalton (amu): a unit of measurement for subatomic particles developed by john dalton.

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