Explain why ionized calcium can form absorption lines, but ionized hydrogen cannot.

Question

Explain why ionized calcium can form absorption lines, but ionized hydrogen cannot.

a. Neutral calcium contains more than one neutron; neutral hydrogen contains only one. There are no electrons in ionized hydrogen and absorption probability is very low.

b. Neutral calcium contains more than one proton; neutral hydrogen contains only one. Hydrogen cannot be ionized.

c. Neutral calcium contains more than one proton; neutral hydrogen contains only one. Hydrogen cannot absorb photons because of its low mass.

d. Neutral calcium contains more than one electron; neutral hydrogen contains only one. There are no electrons in ionized hydrogen to absorb photons

 
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