A. 1s

^{3}, B.1s

^{2}, 2s

^{1}, C. 1s

^{2}, 2p

^{1}, D. 1s

^{1}2p

^{1}3s

^{1}

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. 1s^{2} 2s^{2} 2p^{6} 2d^{6}

B. 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{4}

C. 1s^{2} 2s^{2} 2p^{7} 3s^{1} 3p^{3}

D. 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}

2-4-4. Which of the following is the ground state electron configuration of Al?

A. [Ne] 3s^{2} 3p^{1}

B. [He] 2s^{2} 2p^{6} 3s^{2} 3p^{1}

C. [Mg] 3p^{1}

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]4s

^{2}4p

^{4}

B. [Ar]4s

^{2}4p

^{6}

C. [Ar]4s

^{2}3d

^{10}4p

^{4}

D. [Ar]4s

^{2}3d

^{10}4p

^{6}

2-4-JJW-2. What is the ground state electron configuration for zirconium?

A. [Kr]5s

^{2}5p

^{2}

B. [Kr]5s

^{2}5d

^{2}

C. [Kr]5s

^{2}4d

^{2}

2-4-ALD. Choose the electron configuration that corresponds to an excited state for the K atom.

A. 1s

^{2}2s

^{2}2p

^{6}3s

^{2}3p

^{6}3d

^{1}

B. 1s

^{2}2s

^{2}2p

^{6}3s

^{2}3p

^{6}4s

^{1}

C. 1s

^{2}2s

^{2}2p

^{6}3s

^{2}3p

^{6}

D. None of the above

2-4-CML. Which is the excited electron configuration for strontium?

A. [Kr]5s

^{2}

B. [Kr]5s

^{1}

C. [Kr]5s

^{2}5p

^{1}

D. [Kr]5s

^{1}5p

^{1}