The magnetic quantum number for the valence electron of Caesium is
(1) 3
(2) 0
(3) -3
(4) Any number between +3 to -3

Explanation

To determine the magnetic quantum number for the valence electron of cesium, we can follow these steps:

### Step 1: Identify the Atomic Number of Cesium
Cesium (Cs) has an atomic number of 55. This means it has 55 electrons.

### Step 2: Write the Electron Configuration
The electron configuration for cesium is:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s¹
...