Orbital Diagrams and Electron Configurations Explained

What did Bohr discover about the structure of atoms?

• Atomic mass

• Electron spin

• Energy levels or shells

• Protons and neutrons

Which principle states that electrons fill the lowest energy levels first?

• Heisenberg uncertainty principle

• Aufbau principle

• Pauli exclusion principle

• Hund's rule

According to Hund's rule, how do electrons fill equal energy sub-levels?

• They fill randomly

• They fill the highest energy level first

• They fill one at a time before pairing

• They pair up immediately

What is the maximum number of electrons that the third energy level can hold?

• 18

• 10

• 8

• 32

How many electrons does sulfur have?

• 20

• 16

• 18

• 14

What is the shorthand electron configuration for tungsten?

• [Xe] 6s2 4f14 5d4

• [Rn] 7s2 5f4

• [Xe] 6s2 4f14 5d10

• [Kr] 5s2 4d10 5p6

Which noble gas is used in the shorthand notation for uranium?

• Argon

• Krypton

• Xenon

• Radon

What is the electron configuration for gold?

• [Xe] 4f14 5d9 6s2

• [Kr] 4d10 5p6 6s1

• [Xe] 4f14 5d10 6s1

• [Rn] 5f14 6d9 7s2

Which rule states that no two electrons in the same orbital can have the same spin?

• Heisenberg uncertainty principle

• Hund's rule

• Aufbau principle

• Pauli exclusion principle

What is the significance of noble gases in electron configurations?

• They are used to determine atomic mass

• They have a stable electron configuration

• They are highly reactive

• They have incomplete outer shells