Exploring Electron Configurations and Orbital Notation

What is the electron configuration for carbon?

• 1s2 2s1 2p3

• 1s2 2s2 2p4

• 1s2 2s2 2p2

• 1s2 2s2 2p1

Which noble gas is used as a reference for the abbreviated electron configuration of calcium?

• Argon

• Neon

• Helium

• Krypton

What is the abbreviated electron configuration for niobium (Nb)?

• [Kr] 5s2 4d3

• [Xe] 6s2 5d3

• [Ar] 4s2 3d3

• [Ne] 3s2 2d3

According to the Aufbau principle, which sublevel is filled first?

• 2s

• 1s

• 2p

• 3s

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

• Electrons pair up in the first orbital before moving to the next.

• Electrons fill the highest energy orbital first.

• Electrons pair up only in the s orbital.

• No electron pairs up until every orbital in a sublevel has one electron.

How many unpaired electrons are there in a selenium atom?

• 1

• 0

• 3

• 2

What is the term for materials with unpaired electrons?

• Non-magnetic

• Ferromagnetic

• Paramagnetic

• Diamagnetic

Which principle states that no two electrons in an atom can have the same quantum state?

• Heisenberg uncertainty principle

• Pauli exclusion principle

• Aufbau principle

• Hund's rule

What shape is an s orbital?

• Dumbbell

• Figure-eight

• Butterfly

• Spherical

What is the shape of a d orbital?

• Figure-eight

• Dumbbell

• Spherical

• Four-leaf clover