Understanding Quantum Numbers and Atomic Orbitals

What does the principal quantum number (n) indicate about an electron in an atom?

• The energy level or shell

• The specific orbital within a set

• The type of orbital

• The spin direction

Which quantum number defines the shape of the orbital?

• Principal quantum number (n)

• Angular momentum quantum number (L)

• Magnetic quantum number (M sub L)

• Spin quantum number (M sub S)

How many possible values can the magnetic quantum number (M sub L) have for a d orbital?

• Seven

• Nine

• Five

• Three

According to the Pauli Exclusion Principle, what must be true for two electrons in the same orbital?

• They must be in different energy levels

• They must have the same spin

• They must have different principal quantum numbers

• They must have opposite spins

Given the quantum numbers 4, 0, 0, and -1/2, which orbital is being described?

• 4p orbital

• 4s orbital

• 3p orbital

• 3d orbital