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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Which of the following electronic configurations represents a sudden large gap between  the values of second and third ionisation energies of an element?
  • A
    $1s^2\, ,\,2s^2 \,2p^3$
  • B
    $1s^2 \,,\,2s^2\,2p^6 \,,\,3s^2\,3p^3$
  • C
    $1s^2\, ,\,2s^2\, 2p^6 \,,\,3s^2 \,3p^1$
  • ✓
    $1s^2 \,,\,2s^2\,2p^6\, ,3s^2$
✓

Answer

Correct option: D.
$1s^2 \,,\,2s^2\,2p^6\, ,3s^2$
d
A sudden large jump between the values of second and third ionization energies of an element would be associated with electronic configuration $1 s^{2}, 2 s^{2} 2 p^{6} 3 s^{2}$ $1 s^{2}, 2 s^{2} 2 p^{6} 3 s^{2}$ looses two electrons to form $1 s^{2}, 2 s^{2} 2 p^{6}$ which is stable electronic configuration of noble gas Ne. Octet is completely filled.

When third electron is to be removed, large amount of energy is required as this stable electronic configuration is to be broken.

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