Unit 3 Review

How many energy levels of electrons does magnesium (Mg) have?

• 2

• 3

• 4

• 5

How many energy levels of electrons does uranium (U) have?

• 4

• 5

• 6

• 7

What sublevel has atomic orbitals that are shaped like this?

• s

• p

• d

• f

What sublevel has atomic orbitals that are shaped like this?

• s

• p

• d

• f

What element is this electron energy level diagram showing?

• carbon

• nitrogen

• oxygen

• fluorine

What element is this electron energy level diagram showing?

• carbon

• nitrogen

• oxygen

• fluorine

What is Hund's rule?

• Electrons start at the lowest energy level and build up from there.

• Electrons will fill empty orbitals before pairing.

• Electrons in the same orbitals have opposite spins.

What is the Aufbau principle?

• Electrons start at the lowest energy level and build up from there.

• Electrons will fill empty orbitals before pairing.

• Electrons in the same orbitals have opposite spins.

What is the Pauli exclusion principle?

• Electrons start at the lowest energy level and build up from there.

• Electrons will fill empty orbitals before pairing.

• Electrons in the same orbitals have opposite spins.

Which electron energy level rule does this electron energy level diagram break?

• Aufbau principle

• Hund's rule

• Pauli exclusion principle