Problem: Helium has two electrons in the 1s orbital. When it becomes singly ionized, forming He+,  (A) its spectrum resembles that of the hydrogen spectrum.  (B) the remaining electron is easier to remove.  (C) the nuclear charge has decreased by one. (D) it has lost one atomic mass unit. 

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Helium has two electrons in the 1s orbital. When it becomes singly ionized, forming He+

(A) its spectrum resembles that of the hydrogen spectrum. 

(B) the remaining electron is easier to remove. 

(C) the nuclear charge has decreased by one.

(D) it has lost one atomic mass unit. 

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