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

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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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