Noble Gas Configurations and Electron Filling

This video tutorial explains how to write electron configurations using noble gas configurations, a shorthand notation that simplifies the process by using the noble gas preceding the element of interest. The video provides examples with sodium, iron, barium, and tungsten, demonstrating how to identify the correct noble gas and write the configuration. It also includes an exercise to practice writing and correcting configurations, emphasizing the importance of using the noble gas that comes before the element.

What is the main purpose of using a noble gas configuration?

• To highlight the valence electrons

• To simplify and shorten electron configurations

• To make electron configurations longer

• To avoid using the periodic table

Which noble gas is used as a reference for writing the electron configuration of sodium?

• Argon

• Helium

• Krypton

• Neon

When writing the noble gas configuration for an element, which noble gas should be used?

• The noble gas that comes before the element

• Any noble gas can be used

• The noble gas that comes after the element

• The noble gas closest to the element

What is the noble gas configuration for iron?

• [Ne] 3s2 3p6 4s2 3d6

• [Ar] 4s2 3d6

• [Kr] 4s2 3d6

• [Xe] 4s2 3d6

Which noble gas is used as a reference for barium?

• Neon

• Argon

• Krypton

• Xenon

In the electron configuration of tungsten, which subshell is filled after 6s?

• 5d

• 4f

• 6p

• 5f

What is the correct order of filling subshells for tungsten after the 6s subshell?

• 4f, 5d, 6p

• 6p, 4f, 5d

• 5d, 6p, 4f

• 5d, 4f, 6p

Which element's noble gas configuration is incorrectly written using helium instead of argon?

• Calcium

• Iron

• Vanadium

• Fluorine

Why is it unnecessary to write a noble gas configuration for a noble gas itself?

• Because it has no electrons

• Because it is already in its simplest form

• Because it is not on the periodic table

• Because it is not a metal

What should you do if a noble gas configuration is written incorrectly?

• Correct it by using the correct preceding noble gas

• Ignore it

• Write it in full electron configuration

• Use any noble gas