BIOL 1F90 Chapter Notes - Chapter Chemical bonds: Covalent Bond, Electronegativity, Ion

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Atoms in molecules are held together by chemical bonds. A type of molecule composed of 2 or more elements. Properties differ greatly from the elements that combine to form it. Contains chemical symbols of all atoms found in a molecule. Subscript indicates how many atoms are present in the molecule. Bond that occurs when atoms share a pair of electrons. Occur between atoms with outer shells that are not full. Strong chemical bonds because the shared electrons behave as though they belong to each other. Sharing of multiple electron pairs produces double or triple bonds. Atoms are stable (unreactive) when their outer shell is full. Potential to form covalent bonds is based on the number of electrons needed to fill the outermost shell. Measures an atom"s ability to attract electrons from another atoms in a bond. The more electronegativity, the stronger it pulls shared electrons toward itself. Occurs when 2 atoms of differing electronegativity form a covalent bond.

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