Which of the following has the least ionization potential among these metals? (a) \( \mathrm{Li}...

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Which of the following has the least ionization potential among these metals?
(a) \( \mathrm{Li} \)
(b) \( \mathrm{He} \)
(c) \( \mathrm{N} \)
(d) \( \mathrm{Zn} \)
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