Electron Configurations and Periodic Table Concepts

The video tutorial explains how to write electron configurations for cations, specifically lead 4+, iron 3+, and silver plus. It begins with an overview of the periodic table blocks and the rules for quantum numbers. The tutorial then details the process of writing the electron configuration for each element, adjusting for their cation forms by removing electrons from the highest principal quantum number. Special attention is given to exceptions in electron configurations, such as in the case of silver.

What is the main task described in the video tutorial?

• Identifying noble gases

• Understanding chemical reactions

• Writing electron configurations for cations

• Writing electron configurations for neutral atoms

Which block of the periodic table includes the first two columns?

• F block

• S block

• D block

• P block

What is the noble gas preceding lead in its electron configuration?

• Radon

• Xenon

• Krypton

• Argon

When adjusting the electron configuration for lead 4+, from which subshell are electrons removed first?

• 5d

• 6p

• 4f

• 6s

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

• Neon

• Argon

• Xenon

• Krypton

How many electrons are removed from the 4s subshell when adjusting iron's configuration to iron 3+?

• Two

• One

• Three

• Four

Which noble gas precedes silver in its electron configuration?

• Krypton

• Argon

• Xenon

• Neon

In the electron configuration of silver, which subshell is fully filled due to an exception?

• 5s

• 3d

• 4d

• 6p

When forming silver +, from which subshell is an electron removed?

• 3d

• 5s

• 6p

• 4d

What is the final electron configuration for silver +?

• Krypton 5s1 4d9

• Krypton 4d10

• Krypton 4d9

• Krypton 5s2 4d9