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Notes for Lecture 1-6

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Biology (Sci)
BIOL 112
Lucy- Ann Joseph

Biol 112Typed study guideLecture 1 Small MoleculesChemical bondsHydrogen carbon nitrogen oxygen sulfur and phosphorous are what living matter are made up ofSodium and Potassium are important as ionsThe number of protons defines the identity of the element the atomic numbernumber of protonsAtomic massweight is the number of protons and neutrons added together daltonsIsotopes have the same number of protons but a different number of neutrons can be radioactive which is useful for bio and medicine ex carbon14Covalent Bonds share electrons strong predictable length and anglecovalent bonds are made of 2 electrons theses 2 electrons are shared one electron comes from each atom atoms can form bonds until their outermost shell is filledBut electrons are not always shared equallyWhy does carbon for 4 covalent bondsBecause it has 4 electrons in its outer shell and it wants to have 8 valence electrons so it will form 4 covalent bonds to fill the shellElectronegativity
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