Atomic radius of Cu is greater than that of Cr but ionic radius of `Cr^(2+)` is greater than Cu2+. Give suitable explanation.

Explanation

To explain why the atomic radius of Cu is greater than that of Cr, while the ionic radius of Cr²⁺ is greater than that of Cu²⁺, we can break down the explanation into clear steps:

### Step 1: Understanding Atomic Radius
- The atomic radius is defined as the distance from the nucleus of an atom to the outermost shell of electrons.
- In the case of Copper (Cu) and Chromium (Cr), we need to consider their atomic numbers and electron configurations.

### Step 2: Electron Configuration
- Chromium (Cr) has an atomic number of 24, and its electron configuration is [Ar] 3d⁵ 4s¹.
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