Quantum Numbers, Atomic Orbitals, and Electron Configurations

What does an orbital represent in an atom?

• A fixed orbit around the nucleus

• The exact location of an electron

• A region of probability where an electron can be found

• A specific path an electron follows

How many electrons can each orbital hold?

• 1

• 8

• 4

• 2

What is the principal quantum number (n) used to describe?

• The spin of the electron

• The energy level of the electron

• The shape of the orbital

• The magnetic orientation of the orbital

What does the angular momentum quantum number (l) indicate?

• The spin of the electron

• The magnetic orientation of the orbital

• The energy level of the electron

• The shape of the orbital

How many d orbitals are there per energy level?

• 3

• 5

• 7

• 9

What is the maximum value of the magnetic quantum number (m sub l) if l=2?

• 1

• 4

• 2

• 3

According to the Pauli exclusion principle, why can't two electrons in the same atom have the same set of four quantum numbers?

• Because electrons repel each other

• Because of their opposite spins

• Because no two electrons can occupy the same quantum state

• Because they would have the same energy

What does the Aufbau principle help to determine?

• The shape of orbitals

• The spin of electrons

• The number of electrons in an atom

• The order in which orbitals are filled with electrons

What is the electron configuration of chlorine?

• 1s2 2s2 2p6 3s1

• 1s2 2s2 2p6 3s2 3p5

• 1s2 2s2 2p5

• 1s2 2s2 2p6 3s2 3p6

Atoms with all of their electrons paired are called what?

• Paramagnetic

• Nonmagnetic

• Magnetic

• Diamagnetic