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CGP EDU Academic Team
Published on: August 14, 2026
Assertion: The atomic size generally decreases across a period.
Reason: Effective nuclear charge increases as the atomic number increases across a period.
Text Solution
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The atomic size generally decreases across a period. It is because within the period the outer electrons are in the same valence shell and the effective nuclear charge increases as the atomic number increases, resulting in the increased attraction of electrons to the nucleus
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