Problem: Give the set of four quantum numbers that represent the last electron added (using the Aufbau principle) to the CI atom. A. n = 2, l = 1, ml = +1, ms = + 1/2 B. n = 3, l = 0, ml = 0, ms = - 1/2 C. n = 3, l = 1, ml = +1, ms = + 1/2 D. n = 3, l = 2, ml = +1, ms = - 1/2 E. n = 4, l = 1, ml = - 1, ms = - 1/2

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We are being asked to determine the set of four quantum numbers representing the last electron added to the Cl atom


To solve this, we will first determine the electronic configuration of Cl atom


Recall: For a neutral element, Atomic number = # protons = # of electrons


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Problem Details

Give the set of four quantum numbers that represent the last electron added (using the Aufbau principle) to the CI atom. 

A. n = 2, l = 1, ml = +1, ms = + 1/2 

B. n = 3, l = 0, ml = 0, ms = - 1/2 

C. n = 3, l = 1, ml = +1, ms = + 1/2 

D. n = 3, l = 2, ml = +1, ms = - 1/2 

E. n = 4, l = 1, ml = - 1, ms = - 1/2

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