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Why does electronegativity decrease from right to left within a period?

Why does electronegativity decrease from right to left within a period?
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Why does electronegativity decrease from right to left within a period?

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User Elsimer
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Because as you move from right to left in a period the elements have less valence electrons. As valence electrons get less in number, the electronegativity decreases.
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User Pedrofernandes
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The total positive charge of the nucleus increases.

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User Christophe De Troyer
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