Exploring Electron Configuration

What is the maximum number of electrons that can occupy the first energy level?

• 8

• 1

• 3

• 2

Describe the electron configuration of oxygen.

• 1s² 2s² 2p⁵

• 1s² 2s¹ 2p⁶

• 1s² 2s² 2p⁴

• 1s² 2s² 2p³

What principle states that no two electrons in an atom can have the same set of four quantum numbers?

• Hund's Rule

• Bohr Model

• Heisenberg Uncertainty Principle

• Pauli Exclusion Principle

How many valence electrons does a carbon atom have?

• 8

• 2

• 6

• 4

What is the electron configuration for a sodium ion (Na+)?

• 1s² 2s² 3p⁶

• 1s² 2s² 2p⁵

• 1s² 2s² 2p⁶

• 1s² 2s² 2p⁶ 3s¹

Explain the Aufbau principle in relation to electron configuration.

• The Aufbau principle dictates that electrons fill atomic orbitals starting from the lowest energy level to the highest.

• Electrons fill the highest energy levels first before the lower ones.

• The Aufbau principle states that all orbitals must be filled before any are occupied.

• Electrons fill orbitals randomly without any specific order.

What is the significance of the Pauli Exclusion Principle?

• It determines the speed of chemical reactions.

• It explains the formation of black holes.

• It describes the behavior of light in a vacuum.

• It explains the arrangement of electrons in atoms and the stability of matter.

How do you determine the number of unpaired electrons in an atom?

• The number of unpaired electrons is the total number of electrons in the atom.

• Unpaired electrons are those that are paired with another electron in the same orbital.

• You determine unpaired electrons by counting all electrons in the atom regardless of their pairing.

• The number of unpaired electrons is the total count of electrons that are alone in their orbitals.

What is the electron configuration for the element chlorine?

• 1s² 2s² 2p⁶ 3s² 3p⁵

• 1s² 2s² 2p⁶ 3s² 3p⁴

• 1s² 2s² 2p⁶ 3s² 3p⁶

• 1s² 2s² 2p⁶ 3s² 3p³

Which sublevel is filled after the 4s sublevel?

• 4p

• 5s

• 3d

• 2p