Electron Configurations Page 2
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1
2
3
4Model 2 – Ground State Orbital Diagrams and Electron Configurations
Ground State
Orbital
Diagram
Element Name
Hydrogen
Carbon
Oxygen
Electron
1s
1s
2s
2p
1s
2s
2p
1
2
2
2
2
2
4
Configuration
Ground State
Orbital
Diagram
Element Name
Sodium
Aluminum
Phosphorus
Electron
1s
2s
2p
3s
1s
2s
2p
3s
3p
1s
2s
2p
3s
3p
2
2
6
1
2
2
6
2
1
2
2
6
2
3
Configuration
1.
Examine the orbital diagrams and electron configurations in Model 2. Match each symbol below with its meaning.
_______ a.
I. Single electron
_______ b.
II. Pair of electrons with opposite spins
_______ c.
III. Atomic orbital (a region where electrons are likely to be found)
_______ d.
IV. Subshell (set of orbitals having equivalent energy)
_______ e.
1s
2
2s
2
2p
4
V. Electron configuration
2.
Consider the orbital diagram for oxygen in Model 2.
a.
How many electrons are present in the orbital diagram? _________
b.
Based on its position in the periodic table, explain how you know that your answer to part a is the correct number of
electrons for oxygen. __________________________________________________________
3.
Examine the orbital diagrams and electron configurations in Model 2. Using the following electron configuration:
2
2
4
1 s
2 s
2 p
a.
Underline the energy levels.
b.
Circle the subshells.
c.
Draw a box around the numbers of electrons.
4.
The 2s and 2p subshells are very close in energy, as are the 3s and 3p subshells. Explain how the orbital diagram for sodium
shows that the 3s subshell is lower in energy than the 3p subshell. _________________________________________________
____________________________________________________________________________________________________
5.
The lowest potential energy arrangement of electrons in an atom is called the ground state. Ground state electron configurations
can be predicted by a strict set of rules known was the Aufbau principle (“aufbau” means filling up). Examine the diagrams in
Model 2 and the statements below to determine the phrase that best describes each rule. Circle the correct answer.
a.
Based on where a single electron is placed, the lowest potential energy electron in an atom is found in the ____ subshell.
A. 1s
B. 2s
C. 3s
b.
Electrons will occupy a p-orbital only after _____.
A. the previous s-orbital is half full
B. the previous s-orbital is completely full
C. the previous s-orbital is empty
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