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Periodic Table and Periodicity question

2020 · 2 Sep · Shift 1 · Q7
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Periodic Table and Periodicity question

2020 · 2 Sep · Shift 1 · Q7

JEE MainChemistryPeriodic Table and PeriodicityMCQ+4 / −1
In general the property (magnitudes only) that show an opposite trend in comparison to other properties across a period is
  1. A
    Electron gain enthalpy
  2. B
    Electronegativity
  3. C
    Ionization enthalpy
  4. D
    Atomic radius
View written solutionFree

Correct answer: D

  1. Trends across a period

    As we move from left to right across a period:

    • Effective nuclear charge increases.
    • Therefore, the atom attracts electrons more strongly.

  2. Check each property

    (A) Electron gain enthalpy

    • In general, its magnitude increases across a period.
    • This means atoms tend to gain electrons more readily.

    (B) Electronegativity

    • Increases across a period.

    (C) Ionization enthalpy

    • Increases across a period.

    (D) Atomic radius

    • Decreases across a period because electrons are pulled closer by increasing nuclear charge.

  3. Find the opposite trend

    • Electron gain enthalpy (magnitude), electronegativity, and ionization enthalpy generally increase across a period.
    • Atomic radius generally decreases across a period.

    Hence, the property showing the opposite trend is atomic radius.

  4. Final answer

    D: Atomic radius\boxed{\text{D: Atomic radius}}D: Atomic radius​

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