Which of the following correctly outlines why electronegativity increases across a period?There are more electrons and more repulsion between electronsThe level of electron shielding increases There is an increase in nuclear charge and a decrease in the atomic radiusThe atomic radius decreasesReport feedbackPrevious
Question
Which of the following correctly outlines why electronegativity increases across a period?There are more electrons and more repulsion between electronsThe level of electron shielding increases There is an increase in nuclear charge and a decrease in the atomic radiusThe atomic radius decreasesReport feedbackPrevious
Solution
To determine why electronegativity increases across a period, we need to consider the given options:
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There are more electrons and more repulsion between electrons: This option does not explain why electronegativity increases across a period. The number of electrons and their repulsion do not directly affect electronegativity.
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The level of electron shielding increases: Electron shielding refers to the ability of inner electrons to shield the outer electrons from the full effect of the positive nuclear charge. However, an increase in electron shielding would actually decrease electronegativity, as the outer electrons are less attracted to the nucleus.
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There is an increase in nuclear charge and a decrease in the atomic radius: This option correctly outlines why electronegativity increases across a period. As we move across a period, the number of protons in the nucleus increases, leading to a stronger positive charge. This increased nuclear charge attracts the electrons more strongly, resulting in higher electronegativity. Additionally, the atomic radius generally decreases across a period, which also
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