Noble Gas Electron Configurations

This tutorial explains how to determine the shorthand electron configuration of arsenic. It involves identifying the last noble gas in the periodic table, which is argon for arsenic, and then adding the remaining electrons in their respective orbitals. The video also covers how to adjust the configuration if the element has a charge.

What is the first step in determining the shorthand electron configuration of an element?

• Determine the element's valence electrons.

• Find the atomic number of the element.

• Count the total number of protons.

• Identify the last noble gas before the element.

Why is it important to use noble gases in shorthand electron configurations?

• They provide a stable reference point.

• They are the most reactive elements.

• They have the highest atomic numbers.

• They have the fewest electrons.

When using the periodic table, what direction should you count to find the last noble gas?

• Backward

• Upward

• Diagonally

• Forward

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

• Neon

• Krypton

• Argon

• Helium

How many electrons does argon have?

• 18

• 10

• 20

• 8

What is the electron configuration of arsenic after accounting for argon's electrons?

• [Ar] 3d10 4s2 4p3

• [Ar] 4s2 4p6 3d10

• [Ar] 3s2 3p6 4s2

• [Ar] 4s2 3d10 4p3

What is the total number of electrons in the configuration [Ar] 4s2 3d10 4p3?

• 36

• 28

• 18

• 33

Which orbital is filled after the 4s orbital in the electron configuration of arsenic?

• 3d

• 3p

• 4d

• 4p

What happens to the electron configuration if the element has a charge?

• The element becomes a noble gas.

• The configuration remains the same.

• The number of protons changes.

• The last number in the configuration may change.

What should you do if you have questions about finding shorthand configurations?

• Ignore them and move on.

• Raise your hand and ask.

• Consult a chemistry textbook.

• Search online for answers.