Mastering Electron Configurations and Atomic Orbitals

The video tutorial explains electron configurations, focusing on how electrons are distributed in atomic orbitals. It covers the electron configurations of oxygen, calcium, and nickel, detailing the process of filling orbitals according to energy levels and using principles like the Pauli Exclusion Principle and Hund's Rule. The tutorial also introduces the concept of noble gas core configurations to simplify electron configurations, using argon as an example for calcium and nickel.

What does the electron configuration of an atom represent?

• The distribution of electrons among atomic orbitals

• The number of protons in an atom

• The atomic mass of an element

• The number of neutrons in an atom

How many electrons can a single orbital hold at most?

• 4

• 2

• 6

• 1

What is the ground state electron configuration for an oxygen atom?

• 1s2 2s2 2p4

• 1s2 2s2 2p6

• 1s2 2s2 3p4

• 1s2 2p4

Which principle is used to place electrons in orbitals?

• Avogadro's Principle

• Pauli Exclusion Principle

• Bohr's Principle

• Heisenberg Uncertainty Principle

What is the noble gas core configuration used for calcium?

• Argon

• Krypton

• Neon

• Helium

How many electrons are accounted for by the argon core in calcium's electron configuration?

• 10

• 28

• 18

• 20

What is the ground state electron configuration for a calcium atom?

• 1s2 2s2 2p6 3p6 4s2

• 1s2 2s2 2p6 3s2 4s2

• 1s2 2s2 2p6 3s2 3p6

• 1s2 2s2 2p6 3s2 3p6 4s2

How many electrons are left to place after the argon core in nickel's electron configuration?

• 18

• 10

• 8

• 12

What is the ground state electron configuration for a nickel atom?

• Argon, 3d8, 4s2

• Argon, 4s2, 3d8

• Argon, 3d10, 4s2

• Argon, 4s2, 3d10

How many 3d orbitals are there in nickel's electron configuration?

• 3

• 5

• 7

• 9