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Periodic Table and Periodicity question

2007 · Q96
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Periodic Table and Periodicity question

2007 · Q96

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1
With which of the following electronic configuration an atom has the lowest ionisation enthalpy ?
  1. A
    1s2 2s2 2p3
  2. B
    1s2 2s2 2p5 3s1
  3. C
    1s2 2s2 2p6
  4. D
    1s2 2s2 2p5
View written solutionFree

Correct answer: B

The larger the atomic size, smaller is the value of the ionisation enthalpy. Again higher the screening effect, lesser is the value of ionisation potential, So option(b) has lowest ionisation enthalpy.

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