Electron Configuration Fundamentals and Shortcuts

This video tutorial explains electron configuration, focusing on electrons in the ground state. It covers key principles like the Aufbau principle, Hund's rule, and the Pauli Exclusion Principle. The tutorial demonstrates how to use the periodic table to determine electron configurations and provides examples with elements like hydrogen, helium, lithium, carbon, and sulfur. Viewers are encouraged to test their understanding through a quiz and explore additional resources for further learning.

What is the electron configuration?

• The specific address of an electron within the orbitals and sub orbitals of an atom

• The arrangement of protons in an atom

• The mass number of an atom

• The number of neutrons in an atom

According to the Aufbau principle, how are electrons filled in orbitals?

• From the highest to the lowest energy level

• Randomly

• Only in the s-orbital

• From the lowest to the highest energy level

What does Hund's rule state about electron placement in orbitals?

• Electrons fill the highest energy orbital first

• Electrons do not follow any specific rule

• Electrons fill one electron per orbital before pairing

• Electrons fill orbitals in pairs first

What is the Pauli exclusion principle?

• Electrons can have the same spin in the same orbital

• Electrons must pair up in orbitals

• Electrons fill the highest energy level first

• No two electrons can have the same exact address

How can you determine the number of electrons in a neutral atom using the periodic table?

• By counting the number of neutrons

• By looking at the atomic mass

• By looking at the atomic number

• By looking at the element's symbol

What is the electron configuration for a hydrogen atom?

• 2p1

• 2s1

• 1s2

• 1s1

What is the electron configuration for a helium atom?

• 1s1

• 1s2

• 2s1

• 2p2

What is the electron configuration for a lithium atom?

• 1s2 2s2

• 1s2 2s1

• 1s1 2s2

• 1s2 2p1

What is the electron configuration for a carbon atom?

• 1s2 2s2 2p4

• 1s2 2s1 2p3

• 1s2 2s2 2p2

• 1s2 2s2 2p1

What is the electron configuration for a sulfur atom?

• 1s2 2s2 2p6 3s2 3p2

• 1s2 2s2 2p6 3s2 3p5

• 1s2 2s2 2p6 3s2 3p4

• 1s2 2s2 2p6 3s2 3p3