Chem exam 5
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10 Terms
Bond Energy
the energy needed to overcome the attraction between the nuclei and their shared electrons. The stronger the bond the higher the bond energy. is always endothermic. Takes energy to break bonds.
why is N2 and stronger bond than C2?
the size of N is smaller than C, so bond length between nitrogens is shorter
Electronegativity
the ability of an atom in a covalent bond to attract the shared electron pair to itself
order H, Cl, C, F, N, O based on decreasing EN
F> O > N = Cl > C > H
who came up with the electronegativity scale?
linus pauling
≥ 1.7 EN
mostly ionic
> 0.4 and < 1.7 EN
polar covalent
≤ 0.4 EN
nonpolar covalent
0 EN
fully covalent
unlike covalent molecules, no compound can be fully _____
ionic
Note 
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