BIO 121 Lecture Notes - Lecture 4: Carbon-12, Mass Number, Atomic Nucleus

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1 Feb 2017
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Bio 121 week 2 lecture 4 (continued) Chemistry is defined as the scientific study of atoms and molecules: chemistry and biology are closely related due to atoms and molecules being the lowest levels in the biological hierarchy. Matter is anything (living or nonliving) that takes up space and has mass. Matter exists in three possible states: solid, liquid, gas. Matter is made up of chemical elements: elements are substances that cannot be broken down into other substances, 92 elements occur in nature, others have been synthesized in the lab. 25 elements that are essential to life: the big four make up 96% of living matter. Most of the remaining 4% is made up of seven additional elements. 14 trace elements collectively make up less than 0. 01% of living matter: trace elements are needed in small quantities but are equally essential. Compounds are combinations of two or more elements.

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