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Chapter 2 - commonly encountered in biological systems 1...

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Intro to Physiology Chapter 2 Atoms, Ions and Molecules 1. Elements and Atoms a. Elements: the simplest kinds of matter. Are composed of smaller particles called atoms. i. Ex: oxygen, carbon, hydrogen b. Atoms: Composed of smaller particles i. Protons: has one positive charge 1. 1 atomic mass unit (AMU) ii. Neutron: has no charge 1. 1 atomic mass unit (AMU) iii. Electron: has one negative charge 1. Much smaller then protons and neutrons, it takes 1836 electrons to equal the mass of one neutron. 2. Most atoms have an equal amount of protons and neutrons and thus giving the atom a neutral charge. iv. Nucleus: center of the atom, where most of the protons and neutrons are located. v. Essential Elements: those elements that are necessary for life and
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Unformatted text preview: commonly encountered in biological systems 1. Carbon C 2. Nitrogen N 3. Hydrogen H 4. Oxygen O vi. Trace Elements: the essential elements that are found in very low concentration in living tissues vii. Atomic Number: The number of protons in one atom of an element. viii. Atomic Mass: Calculated by adding the mass of the protons and the neutrons in one atom of the element. ix. Isotope: Atoms of an element that have different numbers of neutrons. The symbol for an isotope shows the atomic mass number written to the upper left of the chemical letter symbol. x. Radioisotopes:...
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