Orbitals, Quantum Numbers & Electron Configuration - Multiple Choice Practice Problems

TL;DR

Learn how to solve quantum number problems by understanding the electron configuration and sublevels.

Transcript

in this video i'm going to go over how to basically solve multiple choice problems relating to quantum numbers so here's one problem what is the maximum number of electrons that can be found in the n equal three energy level now for each of these questions you can pause the video and try it yourself first and then unpause it to see the solution so ... Read More

Key Insights

• 🎚️ The maximum number of electrons in an energy level can be found using the equation 2n².
• 😄 Sublevels have different maximum electron capacities: s (2), p (6), d (10), and f (14).
• 😀 Quantum numbers can be used to identify the sublevel designation based on n and l values.
• ❓ Paramagnetic elements have unpaired electrons, while diamagnetic elements do not.
• 🫀 The electron configuration of an atom can help determine the number of unpaired electrons.
• ❓ Excited states have electron configurations with skipped or missing electron jumps.

Questions & Answers

Q: How can the maximum number of electrons in a certain energy level be found?

The equation 2n² can be used, where n is the energy level. For example, the maximum number of electrons in the third energy level is 2(3)² = 18.

Q: How do you determine the sublevel designation based on n and l values?

When l is 0, it corresponds to the s sublevel. When l is 1, it corresponds to the p sublevel. When l is 2, it corresponds to the d sublevel. And when l is 3, it corresponds to the f sublevel.

Q: What is the maximum number of unpaired electrons in an atom of chromium?

Chromium has an electron configuration of 4s¹ 3d⁵. Despite having 4s² 3d⁴ as the expected configuration, one electron from the 4s sublevel jumps to the 3d sublevel. Thus, there are 6 unpaired electrons in chromium.

Q: How many orbitals are located in the n=4 energy level?

The maximum number of orbitals in an energy level is equal to n². Therefore, the n=4 energy level contains 16 orbitals.

Summary & Key Takeaways

• Quantum numbers are used to describe the energy levels, sublevels, and electron spin in an atom.

• The maximum number of electrons in a certain energy level can be found using the equation 2n².

• Each energy level has different sublevels: s, p, d, and f, each with a maximum number of electrons it can hold.

• Quantum numbers can be used to find the designation of a sublevel based on the given n and l values.