Which of the following is not hydrogen like species?

Which of the following is not hydrogen like species?
  1. $\mathrm{He}$
  2. $\mathrm{Be}^{3+}$
  3. $\mathrm{He}^{+}$
  4. $\mathrm{Li}^{2+}$

Solution

$\mathrm{He}=1 \mathrm{~s}^2$ has $2 \mathrm{e}^{-} \mathrm{s}$

Asked in: MHT CET 2022 (10 Aug Shift 2)

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