Aufbau's Principle, Hund's Rule & Pauli's Exclusion Principle -

According to the Aufbau's principle, where should the first electron go in the orbital diagram?

• 3s

• 2s

• 1s

• 2p

What is the main idea behind Hund's rule?

• Electrons prefer to be paired rather than unpaired

• Electrons should be added to the highest energy level first

• Electrons should be added one at a time with parallel spins

• Electrons should be added in a random order

Why do electrons prefer to be unpaired rather than paired?

• Paired electrons have lower energy

• Paired electrons have lower stability

• Paired electrons repel each other

• Paired electrons have higher energy

Where should the seventh electron go according to Hund's rule?

• 2p

• 3s

• 2s

• 1s

What is the main idea behind Pauli's exclusion principle?

• No two electrons can have the same set of four quantum numbers

• Electrons prefer to be unpaired rather than paired

• Electrons should be added to the lowest energy level first

• Electrons should be added one at a time with parallel spins

Which quantum number describes the size and energy level of the orbitals?

• Magnetic quantum number

• Electron spin

• Principal quantum number

• Angular momentum quantum number

What does the magnetic quantum number describe?

• Electron spin

• Shape of the orbital

• Size and energy level of the orbital

• Orientation of the orbital

What does the electron spin quantum number describe?

• Direction of the electron spin

• Size and energy level of the orbital

• Orientation of the orbital

• Shape of the orbital