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Atomic Structure I
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Slide 1

Atomic Structure

Atomic Structure

Its not about Dalton anymore

Slide 2

First

First

To understand the electronic structure of the atom we need to review the properties of electromagnetic radiation.

Slide 3

Figure 7.1

Figure 7.1

Frequency and Wavelength

c = l n

l = wavelength

n = frequency

C = speed of light

The Wave Nature

of Light

Slide 4

The waveheight or amplitude determines radiation intensity.

The waveheight or amplitude determines radiation intensity.

The wavelength is related to the energy of the radiation.

Slide 5

λ, ν, and Energy

λ, ν, and Energy

As λ decreases and ν increases, what happened to the energy of the radiation?

where h = Plancks constant

(6.626 × 10-34 m2 kg/s)

Slide 6

Regions of the electromagnetic spectrum.

Regions of the electromagnetic spectrum.

The infinite number of wavelengths of

electromagnetic radiation have been classified

into groups as shown below.

Slide 7

SOLUTION:

SOLUTION:

Interconverting Wavelength and Frequency

Use c = ln

= 1.00x10-10 m

= 325x10-2 m

= 473x10-9 m

n =

3x108 m/s

1.00x10-10 m

= 3x1018 s-1

n =

n =

3x108 m/s

325x10-2 m

= 9.23x107 s-1

= 6.34x1014 s-1

Slide 8

SOLUTION:

SOLUTION:

Calculating the Energy of Radiation from Its Wavelength

After converting cm to m, we can use the energy equation, E = hn combined with n = c/l to find the energy.

E = hc/l

E =

6.626X10-34J*s

3x108m/s

1.20cm

x

= 1.66x10-23J

Slide 9

Particle or Wave?

Particle or Wave?

Different behaviors of waves and particles.

Slide 10

The diffraction pattern caused by light

The diffraction pattern caused by light

passing through two adjacent slits.

Slide 11

Light is a waveright?

Light is a waveright?

Light falling on alkali metals causes electrons to be released from the metal.

The # of electrons depends on the intensity of light.

There are specific wavelengths of light that cause the release of e-.

This is called the photoelectric effect.

Slide 12

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