What type of isomerism is shown by the following complexes ?
(i) `[Cr(en)_(3)]^(3+)` (ii) `[Pt(NH_(3))_(4)][PtCl_(4)]`

Explanation

To determine the type of isomerism exhibited by the given complexes, we will analyze each complex step by step.

### Step 1: Analyze the first complex `[Cr(en)₃]³+`

1. **Identify the ligand**: The ligand `en` stands for ethylenediamine, which is a bidentate ligand. This means that each `en` can attach to the central metal atom at two different sites.

2. **Determine the coordination number**: Since there are three `en` ligands, and each is bidentate, the coordination number of chromium (Cr) in this complex is 6 (3 ligands × 2 attachment points).

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