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Quiz #4 Vocabulary

QuestionAnswer
Electronegativity The ability oif an atom to attract electrons in a covalent bond. Dependent upon: charge on nucleus, distance of outer shell electrons form the nucleus, and amount of shielding from inner shell electrons.
Pauling Scale Cesium is lowest at 0.7 and Flourine is highest at 4.0 (Nobel Gases are exempt)
Non-polar Covalent Bond A bond in which the electrons are attracted equally by two atoms, both atoms have the same electronegativity.
Polar Covalent Bond A bond in which the electrons are attracted mopre strongly by one atom than the other. Sets up an uneven charge distribution in the bond, atoms have different electronegattivities.
Dipole A molecule that is electrically unsymmetrical causing it to be oppositely charged at two points. Only applies to covalently bonded atoms.
Polar Molecule A molecule is said to be polar if its centers of negative and positive charge do not coincide.
A covalent bond between two atoms of different electronegativity is . . . always polar.
A covalent bond between two atoms of identical electronegativity is always . . . non-polar.
A molecule is non-polar if . . . the sum of the vectors representing bond polarity is zero.
A molecule is polare if . . . the sum of the vectors representing bond polarity is not zero.
Created by: bilsky22
 

 



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