Quantum Numbers and Electron Configuration

The video tutorial explores a practice problem involving quantum numbers and electron configurations, focusing on a neutral atom of arsenic. It begins by explaining the ground state electron configuration of arsenic, using the periodic table to identify its position and electron distribution. The tutorial then delves into quantum numbers, detailing how to assign them to electrons in the highest energy subshell, specifically the 4p subshell. Key principles such as the Aufbau principle and Hund's rule are discussed to clarify the process of filling orbitals and assigning quantum numbers, including the principal quantum number (n), angular momentum quantum number (L), magnetic quantum number (M sub L), and spin quantum number (M sub S).

What is the main focus of the problem discussed in the video?

• Identifying the isotopes of arsenic

• Determining the atomic mass of arsenic

• Finding the ground state electron configuration and quantum numbers for arsenic

• Calculating the number of protons in arsenic

Which element's electron configuration is being determined in the video?

• Arsenic

• Carbon

• Helium

• Oxygen

What is the abbreviated electron configuration for arsenic?

• [Xe] 6s2 4f14 5d10 6p3

• [Ar] 4s2 3d10 4p3

• [Ne] 3s2 3p6 4s2 3d10 4p3

• [Kr] 5s2 4d10 5p3

What is the highest energy subshell for arsenic?

• 3d

• 4s

• 4p

• 3p

What is the principal quantum number (n) for the electrons in the 4p subshell of arsenic?

• 2

• 4

• 3

• 5

What is the azimuthal quantum number (L) for p orbitals?

• 0

• 3

• 1

• 2

How many possible values can the magnetic quantum number (M sub L) have for p orbitals?

• 3

• 2

• 1

• 4

What are the possible values for the spin quantum number (M sub s)?

• +1 and -1

• 0 and 1

• 0 and -1/2

• +1/2 and -1/2

How are the spins of electrons in the 4p subshell of arsenic aligned?

• Randomly aligned

• Alternating spin up and down

• All spin up

• All spin down

Which rule dictates that one electron is placed in each orbital before any are doubled up?

• Hund's Rule

• Heisenberg Uncertainty Principle

• Pauli Exclusion Principle

• Aufbau Principle