On the basis of `EAN` rule predict the number of unpaired electrons and magnetic moment for the following compounds
(a) `[Cu (NH_(3))_(4)]^(2+)`
(b) `[Cr(NH_(3))_(6)]Cl_(2)` .

Explanation

To solve the question regarding the number of unpaired electrons and magnetic moment for the given coordination compounds based on the Effective Atomic Number (EAN) rule, we will follow these steps:

### Step 1: Calculate the Effective Atomic Number (EAN) for `[Cu(NH₃)₄]²⁺`

1. **Identify the central atom and its atomic number**:
- The central atom is Copper (Cu), which has an atomic number of 29.

2. **Determine the oxidation state of the central atom**:
...