Electron Configurations:

Longhand Configurations

100

What is the electron configuration for H?

1s1

200

What is the electron configuration for carbon?

1s2 2s2 2p2

300

Give the electron configuration for Iron.

1s2 2s2 2p6 3s2 3p6 4s2 3d6

400

What is the electron configuration for Zr?

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d2

500

Give the electron configuration for Pm.

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f5

Working Backward

100

What element has the electron configuration: 1s2 2s2 2p4 ?

Oxygen (O)

200

What element has the electron configuration: 1s2 2s2 2p6 3s2 3p6 4s1 ?

Potassium (K)

300

What element has the electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5 ?

Bromine (Br)

400

What element has the electron configuration [Xe] 6s² 4f¹⁴ 5d¹⁰ 6p² 

Lead (Pb)

500

What element has the electron configuration: [Rn] 5f7 6d1 7s2  ?

Curium (Cm)

Shorthand Configurations

100

What is the electron configuration for Fe?

[Ar] 4s2 3d6

200

What is the electron configuration for Zn?

[Ar] 4s2 3d10

300

What is the electron configuration for Sg?

[Rn] 7s2 5f14 6d4  

400

Write the electron configuration for Np?

[Rn] 7s2 5f5

500

Write the electron configuration for scandium.

[Ar] 4s2 3d1

Electron Configurations for Ions

100

What is the electron configuration for lithium with a charge of +1?

1s2

200

What is the electron configuration for Al⁺³?

1s2 2s2 2p6 

300

What is the electron configuration for S with a -2 charge?

1s2 2s2 2p6 3s2 3p6

400

Write the electron configuration for bromine with 36 electrons?

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

500

how many valence electrons does nitrogen with a charge of -3 have?

8

Miscellaneous

100

How many electrons are in the highest energy level for neutral Boron?

3

200

What is filled after 4s?

3d

300

what element is in the third energy level with 5 valence electrons 

P

400

What rule tells us: to "start at the lowest energy level and build up to the higher energy levels only after the lowest are filled."

Aufbau principle

500

What rule states that: "each orbital must receive one electron before any orbital can receive a second filling electron."

Hund's rule