Paragraph: The hydrogen-like species Li^ 2+ is in a spherically...

Paragraph: The hydrogen-like species $\mathrm{Li}^{2+}$ is in a spherically symmetric state $S_1$ with one radial node. Upon absorbing light the ion undergoes transition to a state $S_2$. The state $S_2$ has one radial node and its energy is equal to the ground state energy of the hydrogen atom.Question: The orbtial angular momentum quantum number of the state $S_2$ is