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Model Paper 7 — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceModel Paper 71 Mark
MCQ
How many electrons are present in the species $He ^{2+}$ ion?
  • A
    2
  • ✓
    $0$
  • C
    4
  • D
    8
✓

Answer

Correct option: B.
$0$
(b) $0$
Explanation: Helium (He) has two electrons in its atom. The cation $\left( He ^{2+}\right)$ is formed through the loss of 2 electrons from the outer-most shell of the atom. Hence, the number of electrons in $He ^{2+}$ will be 0 .

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