Unit 4 Review

Unit 4 Review

Electron Configuration

• Example: Sulfur

• Full- 1s2 2s2 2p6 3s2 3p4

Multiple Choice

Which element has the electron configuration 1s2 2s2 2p5 ?

• Oxygen

• Fluorine

• Neon

• Helium

Multiple Choice

How many valence electrons are in an atom with the electron configuration 1s2 2s2 2p1?

• 1

• 2

• 3

• 4

Electron Configuration

• Example: Sulfur

• Short- [Ne] 3s2 3p6

Multiple Choice

What is the short hand electron configuration for Sr ?

• [Kr] 5s2

• [Xe] 5s2

• [Kr] 4p6 5s2

• [Xe] 4p6 5s2

Fill in the Blank

What is the short electron configuration for the element in period 4 group 1 ?

Bohr Models

• The "Dots" represent electrons which is equal to the atomic number for neutral atoms

Fill in the Blank

What element is represented by this BOHR model?

(put the symbol)

Lewis Dot Structures

Includes the symbol of an element with it's valence electrons represented by "dots"

Multiple Choice

What is the Lewis dot structure of Boron (B) ?

Multiple Choice

Which of these Lewis dot structures is written correctly?

• O

• Na

• Ge

• Ar

Electromagnetic Spectrum

Know the relationships of Energy, Frequency, and Wavelength

Energy & Frequency

Are directly related. If the energy of a wave is low, the frequency is also low.

Multiple Choice

As the energy of a wave decreases, what happens to the wavelength?

• increases

• decreases

• stays constant

Multiple Choice

As the energy of a wave decreases, what happens to the frequency?

• increases

• decreases

Multiple Choice

Compared to red, green wavelength are....

• shorter

• longer

Multiple Choice

Compared to a photon of Orange light, Blue light has...

• smaller momentum

• lower frequency

• greater energy

• longer wavelength

Ground State Vs. Excited State

Multiple Choice

Which of the following is true?

• an electron emits energy as it returns to its ground state

• an electron emits visible light as it moves to an excited state

• an electron absorbs visible light cause it to move to an excited state

• an electron absorbs energy as it returns to its ground state

Fill in the Blank

When an atom is in the excited state and releases energy to return to the ground state, what form of energy is emitted?

Multiple Choice

Which state is considered the "normal" state?

• Ground State

• Excited State