U3L11 DE EC 3 (challenge) - Fri Nov 14 - Quantum Number Review

Three electrons have the following quantum numbers: • Electron A: n = 4, l = 1, m_l = 0, m_s = +½ • Electron B: n = 5, l = 0, m_l = 0, m_s = −½ • Electron C: n = 3, l = 2, m_l = 1, m_s = +½ Which electron has the highest energy in a many-electron atom?

• Electron A

• Electron B

• Electron C

• Electrons A and B have equal energy

An electron has the quantum numbers n = 5, l = 2, m_l = −2, m_s = +½. What is the minimum number of quantum numbers that must change for this electron to move to a 6p orbital?

• 1

• 2

• 3

• 4

An electron is in an orbital where the angular momentum quantum number l = 1. Which of the following sets of quantum numbers is possible for a different electron in the same subshell?

• n = 3, l = 1, m_l = 2, m_s = +½

• n = 4, l = 1, m_l = 0, m_s = 0

• n = 3, l = 1, m_l = −1, m_s = −½

• n = 3, l = 2, m_l = 0, m_s = +½

Two electrons are in the same 4d orbital. Which quantum numbers must be different between them?

• n

• l

• m_l

• m_s

Which set of quantum numbers is IMPOSSIBLE?

• n = 3, l = 2, m_l = 1, m_s = +½

• n = 2, l = 2, m_l = 0, m_s = −½

• n = 4, l = 0, m_l = 0, m_s = +½

• n = 5, l = 3, m_l = −2, m_s = −½

In a many-electron atom, which of the following orbitals has the LOWEST energy?

• 2s

• 2p

• 3s

• 3p

An electron has n = 6, l = 2, m_l = −1, m_s = +½. If you change ONLY n to n = 5 (keeping l, m_l, and m_s the same), what happens to the electron's energy?

• Energy increases

• Energy decreases

• Energy stays the same

• Cannot determine without more information

Consider the following five orbitals in a many-electron atom: • Orbital A: 4p (m_l = −1) • Orbital B: 4p (m_l = 0) • Orbital C: 4p (m_l = 1) • Orbital D: 4s (m_l = 0) • Orbital E: 3d (m_l = 0) Which orbitals are degenerate with each other?

• All five orbitals

• Orbitals D and E

• Orbitals A, B, and C only

• No orbitals are degenerate

An orbital has the maximum possible value of m_l equal to +3. What type of orbital is this?

• s

• p

• d

• f

Four electrons have the following quantum numbers: • Electron W: n = 4, l = 0, m_l = 0, m_s = +½ • Electron X: n = 3, l = 2, m_l = 0, m_s = −½ • Electron Y: n = 4, l = 1, m_l = 1, m_s = +½ • Electron Z: n = 5, l = 0, m_l = 0, m_s = −½ Which electron has the highest energy in a many-electron atom?

• Electron W

• Electron X

• Electron Y

• Electron Z