Ionized calcium can form absorption lines, but ionized hydrogen cannot because ionized hydrogen has no electrons to absorb photons.
Calcium is an important element of the periodic table with symbol Ca and atomic number 20.
The electronic configuration of calcium i.e. 1[tex]s^{2}[/tex]2[tex]s^{2}[/tex]2[tex]p^{6}[/tex]3[tex]s^{2}[/tex]3[tex]p^{6}[/tex]4[tex]s^{2}[/tex] shows that neutral calcium has two electrons in its outermost shell while neutral hydrogen has only one electron.
When ionized calcium absorbs a photon its electrons are promoted form low energy level to high energy levels and as a result of this absorption lines are produced.
On the other hand, atomic number of hydrogen is 1. Ionized hydrogen can not form absorption line because there are no more electron in hydrogen to jump from ground state to excited state. Thus no absorption occurs.
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