Chromium Electron Configuration Concepts

This video tutorial explains how to write the electron configuration for chromium, including its Cr2+ and Cr3+ ions. Chromium is highlighted as an exception to typical electron configuration rules due to its unique stability when its d orbitals are half-filled. The video provides a step-by-step guide using the periodic table and explains the importance of understanding these exceptions. It also covers the condensed notation for chromium and the process of removing electrons to form its ions.

Why is chromium considered an exception in electron configuration rules?

• It has more protons than expected.

• It has a unique atomic number.

• Its electron configuration does not follow the typical order.

• It is a noble gas.

What is the atomic number of chromium?

• 24

• 22

• 26

• 28

How many electrons are used up to the 4s orbital in chromium's electron configuration?

• 22

• 24

• 18

• 20

What is the significance of half-filled d orbitals in chromium?

• They are less stable than other configurations.

• They are more stable than configurations with one less electron.

• They make the atom heavier.

• They have no effect on stability.

What is the electron configuration of chromium in condensed notation?

• [Ar] 3d5 4s1

• [Ar] 3d4 4s2

• [Ar] 3d6 4s0

• [Ar] 3d3 4s2

How many electrons are removed to form Cr2+ from chromium?

• One

• Two

• Three

• Four

Which orbital loses an electron first when forming Cr2+?

• 2p

• 4s

• 3p

• 3d

What is the electron configuration of Cr2+?

• [Ar] 3d3 4s1

• [Ar] 3d4 4s0

• [Ar] 3d4 4s1

• [Ar] 3d5 4s0

How many electrons are removed in total to form Cr3+ from chromium?

• Four

• Three

• Two

• One

What is the electron configuration of Cr3+?

• [Ar] 3d5 4s0

• [Ar] 3d3 4s0

• [Ar] 3d2 4s1

• [Ar] 3d4 4s0