3.7 Explain the force and energy changes that occur when two atoms approach each other and form a bond. Explain why a third body (another atom or molecule) is (almost always) needed to form a stable bond. (Think back to what we learned in Chapter 1.)

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9 Terms

1

What happens when two atoms approach each other?

As atoms approach, attractive forces pull them together, but repulsive forces push them apart.

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2

What causes the attractive forces between atoms?

The electrons of one atom are attracted to the nucleus of the other atom due to electrostatic forces.

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3

What causes the repulsive forces between atoms?

The electrons of both atoms repel each other, and their nuclei also experience repulsion due to their positive charges.

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4

What happens to the energy as two atoms approach and form a bond?

As atoms move closer, potential energy decreases because the attractive forces become stronger, making the system more stable.

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5

What is bonding energy?

Bonding energy is the energy released when atoms form a bond, and it results in the atoms reaching a lower energy state.

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6

Why is a third body often needed for stable bond formation?

A third atom or molecule helps to distribute the energy released during bonding and stabilizes the system, preventing it from breaking apart.

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7

What does the third body do in the bonding process?

The third body helps to balance the forces and energy involved in the bond, leading to a more stable bonding structure.

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8

How does the presence of a third body contribute to bond stability?

The third body helps to release or absorb excess energy, ensuring the system stays stable at a low-energy state.

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9

What is required for bond formation to be stable?

The atoms must release enough energy to overcome repulsive forces and reach a low-energy, stable state. A third body helps achieve this.

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