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Cell Chemistry - Cell Chemistry A Elements 1 Element one...

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9-4-02 Cell Chemistry A. Elements 1. Element - one type of atom -Compound - more than one type of atom bonded chemically - Molecule - more than one atom a. Macroelements(macronutrients) - elements we use in large quantities Ex) C, H, O (65%), N b. Microelements(micronutrients) - elements we use in small quantities Ex) Mg (digest chlorophyll), Fe(hemoglobin, cytochromes), Iodine (thyroids), copper, Mn (enzymes) 2. Atomic Structure a. Atom - smallest unit of an element that still retains the chemical properties of that element. b. Proton - positively charged subatomic particle found in nucleus c. Neutron - neutrally charged subatomic particle found in nucleus d. Electron - negatively charged subatomic particle found outside nucleus e. Atomic Number - the number of protons in an atom denoted by the subscripted number Ex) 1 H Atomic number f. Atomic Mass - the number of protons and neutrons found in an atom, denoted by the superscripted number Ex) 1 H Atomic Mass
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g. Isotopes - The more massive the isotope, the more unstable; the isotope breaks down (radioisotope ) Ex )(Normal)
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