Electron Configuration Principles and Concepts

This video tutorial by Miss Crystal Foley covers Chapter 5, Section 2 on electron configurations in atoms. It explains how electrons are arranged in orbitals around the nucleus, following the Aufbau principle, Pauli exclusion principle, and Hund's rule. The video provides detailed explanations of these principles, examples of electron configurations for hydrogen and oxygen, and a sample problem for phosphorus. It also discusses exceptions in electron configurations, particularly for elements like chromium and copper.

What are the three fundamental principles used to determine electron configurations?

• Bohr's model, Rutherford's model, and Dalton's theory

• Aufbau principle, Pauli exclusion principle, and Hund's rule

• Heisenberg's uncertainty, Schrödinger's equation, and Fermi's paradox

• Newton's laws, Einstein's theory, and Planck's constant

According to the Aufbau principle, which orbitals do electrons fill first?

• Orbitals with opposite spins

• Orbitals with the highest energy

• Orbitals with the same energy

• Orbitals with the lowest energy

What does the Pauli exclusion principle state about electrons in the same orbital?

• They must have opposite spins

• They must have the same spin

• They must be in the same sublevel

• They must be in different energy levels

How does Hund's rule affect the filling of orbitals with the same energy?

• Electrons fill with opposite spins first

• Electrons pair up immediately

• Electrons fill the highest energy orbitals first

• Electrons fill with the same spin direction first

What is the electron configuration for hydrogen?

• 2s1

• 1s2

• 1s1

• 2p1

How many electrons does oxygen have, and how are they arranged in orbitals?

• 10 electrons: 1s2 2s2 2p6

• 6 electrons: 1s2 2s2 2p2

• 8 electrons: 1s2 2s2 2p6

• 8 electrons: 1s2 2s2 2p4

What is the electron configuration for phosphorus?

• 1s2 2s2 2p6 3s2 3p5

• 1s2 2s2 2p6 3s2 3p4

• 1s2 2s2 2p6 3s2 3p6

• 1s2 2s2 2p6 3s2 3p3

Why do chromium and copper have exceptional electron configurations?

• They have more protons than electrons

• They have half-filled or fully filled d sublevels

• They have filled s sublevels

• They have fewer electrons than expected

What is the electron configuration for chromium?

• 1s2 2s2 2p6 3s2 3p6 3d4 4s2

• 1s2 2s2 2p6 3s2 3p6 3d5 4s2

• 1s2 2s2 2p6 3s2 3p6 3d6 4s0

• 1s2 2s2 2p6 3s2 3p6 3d5 4s1

What is the electron configuration for copper?

• 1s2 2s2 2p6 3s2 3p6 3d8 4s2

• 1s2 2s2 2p6 3s2 3p6 3d10 4s2

• 1s2 2s2 2p6 3s2 3p6 3d10 4s1

• 1s2 2s2 2p6 3s2 3p6 3d9 4s2