Biology Exam 1 - Biology Exam 1: Biological Molecules...

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Biology Exam 1: Biological Molecules molecule- 2 or more atoms bonded together molecular formula- representation of combination of molecules compound- molecule composed of 2 or more different elements covalent bonds- join atoms through sharing of electrons atoms tend to be most stable when their outer shells are full of electrons-octet rule double bond- shares 2 pairs of electrons electron orbitals o farther away – higher potential energy o 1 st orbital – 2 max- s- spherical shape o 2 nd orbital- 2 per orbital – 8 totali9 2s - fills up first- 1 st -spherical 2p - 3 p orbitals- 1 per orbital till filled- then double up- dumbbell shaped electronegativity- ability to attract electrons in a bond from another atom o polar covalent bonds- shared electrons closer to atom of higher electronegativity polar molecules- molecules containing significant number of polar bonds nonpolar molecules- have predominantly nonpolar bonds hydrogen bonds allow interactions within and between molecules o hydrogen bonds- weak attraction between partial + and partially – atom ionic bonds involve an attraction between positive and negative ions o ion- if an atom gains or loses one or more electrons and acquires a net charge o cation –net positive charge o
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Biology Exam 1 - Biology Exam 1: Biological Molecules...

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