Quantum Numbers and Atomic Structure Worksheet

Who proposed that electrons orbit the nucleus like planets around the sun?

• Bohr

• Thomson

• Rutherford

• Schrödinger

What does the quantum number n represent in Bohr’s model?

• Electron charge

• Energy level

• Atomic mass

• Orbital shape

Which principle says electrons fill lower energy orbitals first?

• Hund’s Rule

• Aufbau Principle

• Pauli Exclusion Principle

• Quantum Rule

In the quantum mechanical model, where are electrons most likely found?

• Fixed circular paths

• Inside the nucleus

• Orbitals

• Free space

What happens when an electron moves to a lower energy level?

• It gains energy

• It loses energy

• It disappears

• It becomes neutral

Which quantum number describes the main energy level of an electron?

• ℓ

• n

• ml

• ms

If ℓ = 1, what type of orbital is it?

• s orbital

• p orbital

• d orbital

• f orbital

What are the possible values of ml if ℓ = 2?

• 0, 1, 2

• –2, –1, 0, 1, 2

• –1, 0, 1

Two electrons in the same orbital must have:

• The same spin

• Different spins

• Different energy levels

• The same magnetic number

What quantum number tells the shape of an orbital?

• Principal quantum number

• Azimuthal quantum number

• Magnetic quantum number

• Spin quantum number