BIOL 1F90 Lecture Notes - Lecture 2: Positron Emission Tomography, Electronegativity, Covalent Bond

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For chemical reactions, the number of atoms is often more important than the mass: 1 g of hydrogen has more atoms than 1 g of carbon, because carbon has a larger mass. 1 mole of any element contains 6. 022 x 1023 atoms: = avogadro"s constant, the same number of atoms as in exactly 12 g of carbon. Multiple forms of an element that differ in the number of neutrons. Radioisotopes: unstable isotopes found in nature: lose energy through radiation, emit subatomic particles (radioactivity) Modern medicine makes use of the high energy level of radioisotopes: e. g. Many mineral and trace elements that are a small percentage of total mass are essential for normal growth and function. Molecule: 2 or more atoms bonded together, atoms in molecules are held together by chemical bonds. Compound: a type of molecule composed of 2 or more elements, properties differ greatly from the elements that combine to form it.

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