Which of the following cannot be formed?

Which of the following cannot be formed?
  1. \(\mathrm{He}^{2+}\)
  2. \(\mathrm{He}^{\oplus}\)
  3. He
  4. \(\mathrm{He}_{2}\)

Solution

$\mathrm{He}_{2}$: $\sigma 1 s^{2}, \sigma^{*} 1 s^{2}$
Bond Order $=\frac{2-2}{2}=0$
Not formed, does not exist

Asked in: JEE-TOPICTESTS-CHEMISTRY

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