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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
The electron affinity of $Be$ is similar to :-
  • ✓
    $He$
  • B
    $B$
  • C
    $Li$
  • D
    $Na$
✓

Answer

Correct option: A.
$He$
a
He being noble gas has complete 1 st shell It has completed its duplet. While $B e$ Has electronic configuration $1 s^{2}, 2 s^{2}$ so be also has completely filled $2 s$ subshell so we can say that, The electron affinity of $B e$ is similar to $B e$ among the given options.

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