Write the general electronic configuration of transition elements or d-block elements.

Explanation

To write the general electronic configuration of transition elements (or d-block elements), we can follow these steps:

### Step 1: Identify the d-block elements
The d-block elements are found in groups 3 to 12 of the periodic table. They include transition metals such as iron (Fe), copper (Cu), and nickel (Ni).

### Step 2: Understand the electronic configuration
The electronic configuration of an element describes the distribution of electrons in its atomic orbitals. For transition elements, the configuration involves both the d and s orbitals.

...