define electro negativity.
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Electronegativity is a measure of an atom's ability to attract shared electrons to itself. On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group.
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Basically the electronegativity, symbol χ, measures the tendency of an atom. The electronegativity is not a property of an atom alone, but rather a property of an atom in a molecule. The electronegativity between hydrogen and bromine is 0.73.
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