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Question
Explain the following:
Electronegativity of elements increase on moving from left to right in the periodic table.
Solution
The electronegativity generally increases on moving across a period from left to right (e.g., from \[\ce{Li}\] to \[\ce{F}\] in the second period). This is due to decrease in atomic size and increase in effective nuclear charge. As a result of increase in effective nuclear charge, the attraction for the outer electron and the nucleus increases in a period and therefore, electronegativity also increases.
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