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

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
Choose the incorrect order?
  • A
    $Li > O > F$      ( $IE_2$ order)
  • B
    $Mg < S < Cl$      ( $EA$ order)
  • C
    $I > Br > N > O > F$     (Size)
  • ✓
    $Na < K < Ca$      $(Z_{eff})$
✓

Answer

Correct option: D.
$Na < K < Ca$      $(Z_{eff})$
d
As per Slater's rule

$\mathop {Li}\limits_{(1.3)}  < \mathop {Na}\limits_{(2.2)}  = \mathop K\limits_{(2.2)}  < \mathop {Ca\,\,\,\,\,\,\,\,\,\,}\limits_{(2.85) \leftarrow {Z_{eff}}} $

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