The interaction energy between atom A and B is 400 kJ/mol^-1. The type of interaction between them is

(1) pi – pi.
(2) covalent.
(3) ion-dipole.
(4) hydrogen bond.

Understanding Atomic Interaction Energy: Identifying Bond Types

What is Atomic Interaction Energy?

Atomic interaction energy refers to the energy required to form or break a bond between two atoms. Different types of bonds have characteristic interaction energy values.

How to Determine the Bond Type?

H1: The Role of Interaction Energy in Bond Formation

The strength of a bond depends on the interaction energy between the atoms involved. The stronger the bond, the higher the energy required to break it.

H2: Given Interaction Energy and Bond Type

The given interaction energy is 400 kJ/mol. Let’s analyze the options:

1. pi – pi interaction ❌
   • Pi-pi interactions are weak non-covalent interactions, usually around 10-50 kJ/mol.
2. Covalent bond ✅
   • Covalent bonds typically have interaction energy between 150-400 kJ/mol, making this the most suitable choice.
3. Ion-dipole interaction ❌
   • Ion-dipole interactions are weaker, generally ranging from 50-200 kJ/mol.
4. Hydrogen bond ❌
   • Hydrogen bonding energy is usually 10-40 kJ/mol, significantly lower than 400 kJ/mol.

H3: Correct Answer

The correct answer is:

(2) Covalent bond

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