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- The electron configuration of a Cr 3+ ion is [Ar]4s23d4. [Ar]4s13d2. [Ar]3d5. [Ar]3d3. [Ar]4s13d5.Use the electron configurations of NO− and NO+ to predict which is likely to have the shorter bond length.Identify two ions that have the following ground-state electronconfigurations: (a) 3Ar4, (b) 3Ar43d5, (c) 3Kr45s24d10.
