The reluctance of valence shell s-electrons pair to get unpaired and to participate in bond formation is called ………………….. .

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes the reluctance of valence shell s-electron pairs to become unpaired and participate in bond formation.

2. **Identifying the Concept**: In chemistry, particularly in the context of p-block elements, there is a phenomenon where the s-electrons in the valence shell do not easily unpair. This is important when considering the oxidation states of elements in groups 13, 14, and 15.

3. **Defining the Phenomenon**: The reluctance of these s-electrons to unpair is due to the stability associated with having a filled s-orbital. When these electrons remain paired, they do not contribute to bonding as effectively as they could if they were unpaired.

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