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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
$B{e^{2 + }}$ is isoelectronic with
  • A
    $M{g^{2 + }}$
  • B
    $N{a^ + }$
  • ✓
    $L{i^ + }$
  • D
    ${H^ + }$
✓

Answer

Correct option: C.
$L{i^ + }$
c
$Be ^{2+}$ is isoelectronic with $Li ^{+}$.

Both contain $2$ electrons.

They have an electronic configuration $Be ^2=1 s ^2= Li ^{+}$.

This is equal to the electronic configuration of $He$.

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