2-4 Write or identify ground state and excited state electron configurations

2-4-1. Which of the following is not a valid electron configuration for a lithium atom, which has 3 electrons?
A. 1s³, B.1s², 2s¹, C. 1s², 2p¹, D. 1s¹ 2p¹ 3s¹

2-4-2. In a typical atom, which of these orbitals is filled last?
A. 3p, B. 3d, C. 4s, D. 4p

2-4-3. Which of the following is the ground state electron configuration of Sulfur?
A. 1s² 2s² 2p⁶ 2d⁶
B. 1s² 2s² 2p⁶ 3s² 3p⁴
C. 1s² 2s² 2p⁷ 3s¹ 3p³
D. 1s² 2s² 2p⁶ 3s² 3p⁶

2-4-4. Which of the following is the ground state electron configuration of Al?
A. [Ne] 3s² 3p¹
B. [He] 2s² 2p⁶ 3s² 3p¹
C. [Mg] 3p¹
D. all of the above

2-4-5. How many electrons are unpaired in the ground state of Oxygen?
A. 0, B. 1, C. 2, D. 3

2-4-6. Which of the following atoms is not paramagnetic?
A. Na, B. Mg, C. C, D. Ti

2-4-JJW-1. What is the ground state electron configuration of Se^2-?
A. [Ar]4s²4p⁴
B. [Ar]4s²4p⁶
C. [Ar]4s²3d¹⁰4p⁴
D. [Ar]4s²3d¹⁰4p⁶

2-4-JJW-2. What is the ground state electron configuration for zirconium?
A. [Kr]5s²5p²
B. [Kr]5s²5d²
C. [Kr]5s²4d²

2-4-ALD. Choose the electron configuration that corresponds to an excited state for the K atom.
A. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹
B. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
C. 1s² 2s² 2p⁶ 3s² 3p⁶
D. None of the above

2-4-CML. Which is the excited electron configuration for strontium?
A. [Kr]5s²
B. [Kr]5s¹
C. [Kr]5s²5p¹
D. [Kr]5s¹5p¹