BIO 121 Chapter Notes - Chapter 2: Radionuclide, Mass Number, Atomic Number

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Concept 2. 1: matter consists of chemical elements in pure form and in combinations called compounds matter: anything that takes up space and has mass. Element: a substance that cannot be broken down to other substance by chemical reactions. Compound: a substance consisting of two or more different elements combined in a fixed ratio. Essential elements: an organism needs these to live a healthy life and reproduce. Trace elements: required by an organism in only minute quantities. Case study: evolution of tolerance to toxic elements. Co(cid:374)(cid:272)ept 2. 2: a(cid:374) ele(cid:373)e(cid:374)t"s properties depe(cid:374)d o(cid:374) the stru(cid:272)ture of its ato(cid:373)s. Atom: the smallest unit of matter that still retains the properties of an element. Rapidly (cid:373)ovi(cid:374)g ele(cid:272)tro(cid:374)s for(cid:373) a (cid:862)(cid:272)loud(cid:863) of (cid:374)egative (cid:272)harge arou(cid:374)d the (cid:374)u(cid:272)leus, a(cid:374)d it is the attraction between opposite charges that keeps the electrons in the vicinity of the nucleus. Neutrons and protons are almost identical in mass.

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