Calcium represented in the spectrum below. So Option 'D' is the correct answer.
Spectrum and calcium:
A spectrum is a graph or chart that depicts the intensity of light emitted over a range of energies.
Excitation of conduction electrons of any element is the subject of atomic spectroscopy. Because sodium has just one electron in its outermost shell and calcium has two, their atomic spectra should contain one and two atomic spectral lines, respectively.
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