Electron Configuration Quiz: Test Your Knowledge!

A 'd' subshell has 5 orbitals, and each orbital can hold a maximum of 2 electrons.

Hund's rule maximizes the number of unpaired electrons.

Copper normally has [Ar]3d¹⁰4s¹. When it loses two electrons to form Cu²⁺, it loses the 4s electron and one 3d electron.

Neon has the configuration 1s²2s²2p⁶.

c) Pauli exclusion principle: This means each orbital can hold a maximum of two electrons with opposite spins.

Chromium is an exception to the Aufbau principle. A half-filled d subshell is more stable.

Nitrogen has the configuration 1s²2s²2p³. According to Hund's rule, the three p electrons occupy separate orbitals.

Sulfur gains two electrons to form S²⁻, filling its p subshell.

3d. according to the Aufbau principle.

There are seven f orbitals, each holding two electrons.

Molybdenum (Z = 42) is an exception to the Aufbau principle. Its expected electron configuration would be [Kr] 5s² 4d⁴, but the actual configuration is [Kr] 5s¹ 4d⁵. This occurs because a half-filled d-subshell (4d⁵) is more stable due to exchange energy and symmetrical electron distribution.

The valence electrons are in the 4s² and 4p⁴ subshells, totaling 6.

Explanation: According to the Pauli Exclusion Principle, each orbital can hold a maximum of 2 electrons with opposite spins.