Slide 1 of 20

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Electron Arrangement in Atoms

> The Development of Atomic Models

The timeline shoes the development of atomic models from 1803 to 1911.

5.1

Slide 2 of 20

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Electron Arrangement in Atoms

> The Development of Atomic Models

The timeline shows the development of atomic models from 1913 to 1932.

5.1

Slide 3 of 20

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Electron Arrangement in Atoms

> Atomic Orbitals

Different atomic orbitals are denoted by letters. The s orbitals are spherical, and p orbitals are dumbbell-shaped.

5.1

Four of the five d orbitals have the same shape but different orientations in space.

Slide 4 of 20

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Electron Arrangement in Atoms

> Electron Configurations

The ways in which electrons are arranged in various

orbitals around the nuclei of atoms are called

__________________ configurations.

Three rules—

the _____________ principle,

the _________ ____________

principle, and ____________ rule.

5.2

Slide 5 of 20

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Electron Arrangement in Atoms

> Electron Configurations

Aufbau Principle

According to the ____________ principle,

electrons occupy the orbitals of

_____________ energy _______________.

In the aufbau diagram below, each box

represents an atomic orbital.

5.2

Slide 6 of 20

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Electron Arrangement in Atoms

>

Slide 7 of 20

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Electron Arrangement in Atoms

> Electron Configurations

Pauli Exclusion Principle

According to the __________

_____________ principle, an atomic orbital

may describe at most _________ electrons.

To occupy the same orbital, two electrons

must have ___________ spins; that is, the

electron spins must be _____________.

5.2

Slide 8 of 20

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Electron Arrangement in Atoms

> Electron Configurations

Hund’s Rule

______________ rule states that electrons

occupy orbitals of the same

_______________ in a way that makes the

number of electrons with the __________

____________ direction as ______________

as possible.

5.2

Slide 9 of 20

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Electron Arrangement in Atoms

> Electron Configurations

Orbital Filling Diagram

5.2

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Slide 11 of 20

Practice Problems for Conceptual Problem 1.1

8. Write the electron configuration for each atom.a. carbon b. argon c. nickel

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Slide 12 of 20

Practice Problems for Conceptual Problem 1.1

Problem Solving 5.9 Solve Problem 9 with the help of an interactive guided tutorial.