BIOL 001 Lecture Notes - Lecture 2: Electron Shell, Chemical Polarity, Chemical Bond

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31 May 2016
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Other than the first shell, all other shells are stable when at the least 8 e"s are present. The outermost electron shell of any atom is the valence shell. Chemical bonds: attractive forces between two atoms by way of valance e"s for a stable chemical structure. When different elements combine in a fixed ration a chemical bond/chemical compound occurs. By definition a molecule is a shared electron, this is technically different. Two or more atoms share the electron (non metals) Covalent bonds normally are shown with solid lines between the atoms. In biology, covalent bond is the strongest because it stays together. Electronegativity is an atom"s attraction for electrons in chemical bonds. Atoms of a similar electronegativity are bound covalently. The electrons are shared equally and the electron orbits are round. When electronegativities of atoms within a molecule differ, the shared electrons are pulled closer the atom having the higher electron affinity.

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