Which of the Following Three Sets Consist of Atoms or Ions

question 14

Multiple Choice

Which of the following three sets consist of atoms or ions with the same electron configuration in the ground state?
(I) O^2-,Ne,and Mg²⁺
(II) Ni,Cu⁺,and Zn²⁺
(III) Hg,Tl⁺,and Pb²⁺

• A)all three sets
• B)all but (I)
• C)all but (II)
• D)only (I)

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