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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
Elements after atomic number $103$ have been discovered till now. If an element with atomic number $106$ were ever discovered which of the following electronic configuration will it possess
  • A
    $[Rn]\,5{f^{14}}\,6{d^4}\,7{s^2}$
  • ✓
    $[Rn]\,5{f^{14}}\,6{d^5}7{s^1}$
  • C
    $[Rn]\,5{f^{14}}\,6{d^6}\,7{s^0}$
  • D
    $[Rn]\,5{f^{14}}\,6{d^1}\,7{s^2}\,7{p^3}$
✓

Answer

Correct option: B.
$[Rn]\,5{f^{14}}\,6{d^5}7{s^1}$
b
$Z=106 \rightarrow\left[R_n\right] 5 f^{14} 6 d ^5 7 s ^1$

$\left[R_n\right]\,Z=26$

$7 s^2 \rightarrow d^4+1=d^5$

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