Quantum Numbers & Electron Configuration

The electron configuration of an atom is 1s²2s²2p⁶.  The number of electrons in the atom is 

• 3
• 6
• 8
• 10

An orbital can at most hold how many electrons?

• 1 electron
• 2 electrons
• 3 electrons
• 4 electrons

Which of the following statements regarding electronic orbitals is/are correct?

• Each p-orbital can hold a maximum of six electrons.

• The 3p-orbitals have a higher energy level than the 3s-orbital.

• The three 3p-orbitals have slightly different energy levels.

• The 1s-orbital has the same size and shape as the 2s-orbital.

What is the Aufbau principle?

• Within an energy level, s orbitals are the lowest energy, followed by p, d and then f. F orbitals are the highest energy for that level.

• The lower the principal quantum number (n) the lower the energy.

• All three.

• The Aufbau Principle states that electrons enter the lowest energy orbitals first.

Identify the rule that is being violated

• Aufbau's Principle

• Hund's Rule

• Pauli's Exclusion Principle

• Heisenberg uncertainty principle

All orbitals of equal energy (degenerate orbitals) are occupied by one electron before any single orbital is occupied by a second electron.

• Aufbau Principle

• Pauli's Exclusion Principle

• Hund’s Rule

• Core Notation

What is incorrect about this orbital diagram?

• Both arrows in the filled 2p box should be pointing the same direction

• There is nothing incorrect with this diagram

• In the there should only be 1 arrow in the first 2p box and one in the 2nd 2p box

• All the arrows should be pointing the same direction.

No two electrons in the same atom can have the same four quantum numbers.

• Aufbau Principle

• Pauli's Exclusion Principle

• Hund’s Rule

• Noble gas notation

Which rule is violated in the following orbital diagrams?

• Hund's Rule

• Aufbau Principle

• Pauli's Exclusion Principle

Which rule is violated in the following orbital diagrams?

• Aufbau Principle

• Hund's Rule

• Pauli's Exclusion Principle