Mastering Electron Configuration and Orbital Diagrams

The video tutorial explains orbital diagrams, which depict electron arrangements in atoms. It covers three main rules: the Aufbau principle, which dictates electrons fill the lowest energy orbitals first; the Pauli Exclusion Principle, which limits orbitals to two electrons; and Hund's Rule, which requires electrons to occupy all orbitals of equal energy before pairing. The tutorial demonstrates these principles by constructing an orbital diagram for iron, illustrating electron distribution across various energy levels and sub-levels.

What is the primary concept of the Aufbau principle?

• Electrons fill the highest energy orbitals first.

• Electrons fill orbitals based on atomic number.

• Electrons fill the lowest energy orbitals first.

• Electrons fill orbitals randomly.

Which orbital is filled immediately after the 1s orbital according to the Aufbau principle?

• 3p

• 2p

• 2s

• 3s

How many electrons can the 2p sub-level hold in total?

• 8

• 6

• 4

• 2

What is the correct order of filling for the 3s, 3p, and 3d orbitals?

• 3d, 3s, 3p

• 3s, 3d, 3p

• 3s, 3p, 3d

• 3p, 3s, 3d

What does the Pauli Exclusion Principle state about electron occupancy in orbitals?

• An orbital can hold a maximum of three electrons.

• An orbital can hold a maximum of two electrons.

• An orbital can hold only one electron.

• An orbital can hold an unlimited number of electrons.

According to Hund's Rule, how do electrons fill orbitals of equal energy?

• Electrons fill all orbitals singly before pairing up.

• Electrons fill the highest energy orbital first.

• Electrons pair up in each orbital before moving to the next.

• Electrons fill orbitals randomly.

Which principle explains why electrons in the same orbital must have opposite spins?

• Aufbau Principle

• Pauli Exclusion Principle

• Hund's Rule

• Bohr's Model

Which of the following is NOT a rule for electron configuration?

• Aufbau Principle

• Pauli Exclusion Principle

• Hund's Rule

• Bohr's Rule

In the electron configuration of iron, which orbital is filled after the 3p orbital?

• 4s

• 4p

• 2s

• 3d

What is the total number of electrons in the 3d sub-level for iron?

• 4

• 5

• 6

• 10