Lecture Week 4_2.3 Electronic Configuration

The electron fills in the orbital from lower to the higher energy of orbital. State the name of rule used for the statement above.

Answer explanation

Aufbau's Principle

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.

Which one of the following does not represent the electronic configuration of an atom in its ground state?

• 1s² 2s² 2p³

• 1s² 2s² 2p⁴

• 1s² 2s² 2p⁶ 3s¹

• 1s² 2s² 2p⁶ 3d¹

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

• 3
• 6
• 8
• 10

What electron configuration matches an sulphur atom?

(Z =16)

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵

• 1s²2s²2p⁴

• 1s²2s²2p⁶ 3s² 3p⁴

• 1s²2s²2p⁶3s²3p⁶4s²3d¹

No two electrons in the same orbital can have the same set of four quantum numbers (n,l,m,s)

• Aufbau principle

• Pauli exclusion principle

• Hund’s rule

• Noble gas notation

Which orbital shows a violation of the Pauli Exclusion Principle?

• A

• B

• C

• D

Which of the following is the degenerate orbitals

• 4p orbitals

• 3s orbital

• 4s orbital

• 3d orbitals

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 2p orbital there should only be 1 arrow in the first 2p box and another one arrow in the 2nd 2p box where both arrow pointing upward

• All the arrows should be pointing the same direction.