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Which of these have the same number of electrons? I. Br-, Kr, Sr2+ II. C, N-,...

Which of these have the same number of electrons?

I. Br-, Kr, Sr2+

II. C, N-, O2-

III. Mg2+, Ca2+, Sr2+

IV. O2-, O, O2+

V. Ag+, Cd2+, Pd

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