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Multiple choice

Which of the following ions have [Ar] 3d5 4s0 configuration? P. Cr3+ Q. Mn2+ R. Fe3+ S. Co3+ Select the correct answer using codes given below:

  1. P and Q

  2. P and S

  3. Q and R

  4. Q and S

  5. R and S

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

25Mn: [Ar] 3d5 4s2 Mn2+: [Ar] 3d5 4s0 26Fe: [Ar] 3d6 4s2 Fe3+: [Ar] 3d5 4s0

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