The total number of electrons on the central atom including those gained by bonding is called the________ abbreviated as_______ .

Answer

To solve the question, we need to identify the term that describes the total number of electrons on the central atom, including those gained through bonding, and its abbreviation.

### Step-by-Step Solution:

1. **Understanding the Concept**: The question asks about the total number of electrons on the central atom, which includes both the electrons that the atom originally possesses and those that it gains through bonding with ligands.

2. **Identifying the Term**: The term that describes this total number of electrons is known as the "Effective Atomic Number." This term reflects the effective electron count that contributes to the stability of the central metal ion in coordination compounds.

3. **Abbreviation**: The abbreviation for Effective Atomic Number is "EAN."

4. **Final Answer**: Therefore, the complete answer to the question is:
- The total number of electrons on the central atom including those gained by bonding is called the **Effective Atomic Number** abbreviated as **EAN**.