Electron Configurations and Noble Gases

This video tutorial covers electron configurations, focusing on shorthand notation. It begins with an introduction to electron configurations using sodium as an example. The video then explains how to use noble gases for shorthand notation, providing examples with beryllium, sulfur, and calcium. Finally, it discusses d-block elements, specifically manganese, and highlights the importance of d subshells in chemical reactions.

What is the electron configuration of sodium in full notation?

• 1s2 2s2 2p6 3s2

• 1s2 2s2 2p5 3s2

• 1s2 2s2 2p6 3p1

• 1s2 2s2 2p6 3s1

Why are only the outer shell electrons involved in chemical reactions?

• They are the heaviest.

• They are the most stable.

• They are closest to the nucleus.

• They are the least stable.

Which noble gas is used for the shorthand electron configuration of sodium?

• Krypton

• Argon

• Neon

• Helium

What is the shorthand electron configuration for beryllium?

• Ne 3s2

• He 2s2

• Kr 5s2

• Ar 4s2

Which noble gas is used for the shorthand electron configuration of sulfur?

• Helium

• Neon

• Argon

• Krypton

What is the full electron configuration for calcium?

• 1s2 2s2 2p6 3s2 3p6 4s2

• 1s2 2s2 2p6 3s2 3p6 3d2

• 1s2 2s2 2p6 3s2 3p6 4p2

• 1s2 2s2 2p6 3s2 3p6 4d2

What is the shorthand electron configuration for calcium?

• He 2s2 2p6 3s2

• Kr 5s2

• Ar 4s2

• Ne 3s2 3p6 4s2

What is the full electron configuration for manganese?

• 1s2 2s2 2p6 3s2 3p6 3d10 4s1

• 1s2 2s2 2p6 3s2 3p6 3d3 4s2

• 1s2 2s2 2p6 3s2 3p6 4s2 4p5

• 1s2 2s2 2p6 3s2 3p6 3d5 4s2

Why is the d subshell shown in the shorthand electron configuration for d-block elements?

• Because they can be involved in chemical reactions.

• Because they are not involved in reactions.

• Because they are the heaviest electrons.

• Because they are the most stable.

Which noble gas is used for the shorthand electron configuration of manganese?

• Neon

• Krypton

• Argon

• Helium