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Electronegativity decreases across a period and increases down a group.
Electronegativity increases across a period and decreases down a group.
Electronegativity increases across a period and remains constant down a group.
Electronegativity decreases across a period and remains constant down a group.
Understanding the Answer
Let's break down why this is correct
Across a period the number of protons increases while the shielding electrons stay almost the same, so the nucleus pulls more strongly on the electrons that want to join. Other options are incorrect because This answer mixes up the direction; Keeping electronegativity the same down a group ignores the extra shells that shield the outer electrons.
Key Concepts
Electronegativity
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Definition
Electronegativity measures an atom's ability to attract shared electrons in a molecule. It influences bond polarity and chemical reactions. Electronegativity trends across periods and groups provide insights into the nature of chemical bonds and the behavior of compounds.
Topic Definition
Electronegativity measures an atom's ability to attract shared electrons in a molecule. It influences bond polarity and chemical reactions. Electronegativity trends across periods and groups provide insights into the nature of chemical bonds and the behavior of compounds.
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