Electron Configuration and Stability Concepts

The video tutorial explains the exceptions to the standard rules of electron configuration, focusing on Chromium and Copper. It highlights the importance of understanding the basic rules before delving into exceptions. Chromium and Copper deviate from the expected electron filling order to achieve more stable configurations. Chromium fills its 3d subshell before completing the 4s subshell, resulting in a half-filled 3d subshell. Similarly, Copper fills its 3d subshell fully before completing the 4s subshell, leading to a more stable configuration. These exceptions are due to the stability provided by half-filled and fully filled subshells.

Why is it important to understand the basic rules of electron configuration before learning about exceptions?

• Because exceptions are the same as the basic rules.

• Because basic rules are never used.

• Because exceptions are not important.

• Because exceptions are more complex and require a foundational understanding.

What is the electron configuration of Chromium?

• 1s²2s²2p⁶3s²3p⁶3d⁴4s²

• 1s²2s²2p⁶3s²3p⁶3d³4s²

• 1s²2s²2p⁶3s²3p⁶3d⁶4s⁰

• 1s²2s²2p⁶3s²3p⁶3d⁵4s¹

Why does Chromium have a half-filled 3d subshell?

• To fill the 4s subshell first.

• To make it less stable.

• To achieve a more stable configuration.

• To increase its energy.

What is the main reason for the stability of Chromium's electron configuration?

• It has a fully filled 4s subshell.

• It has a half-filled 3d subshell.

• It has a fully filled 3d subshell.

• It has an empty 3d subshell.

What is the electron configuration of Copper?

• 1s²2s²2p⁶3s²3p⁶3d⁷4s²

• 1s²2s²2p⁶3s²3p⁶3d⁹4s²

• 1s²2s²2p⁶3s²3p⁶3d¹⁰4s¹

• 1s²2s²2p⁶3s²3p⁶3d⁸4s²

Why does Copper have a filled 3d subshell?

• To make it less stable.

• To achieve a more stable configuration.

• To fill the 4s subshell first.

• To increase its energy.

What is the main reason for the stability of Copper's electron configuration?

• It has a half-filled 3d subshell.

• It has an empty 3d subshell.

• It has a fully filled 4s subshell.

• It has a fully filled 3d subshell.

What is the common reason for the exceptions in electron configurations of Chromium and Copper?

• To achieve a more stable configuration.

• To increase their energy.

• To fill the 4s subshell first.

• To make them less stable.

Which subshell is filled first according to the general rules of electron configuration?

• 5s subshell

• 4s subshell

• 3d subshell

• 2p subshell

What is the electron configuration notation for a fully filled 3d subshell?

• 3d⁵

• 3d⁹

• 3d¹⁰

• 3d⁷