Chemistry Practice Problems Paramagnetic and Diamagnetic Practice Problems Solution: There are _____ unpaired electrons in ground state...

Solution: There are _____ unpaired electrons in ground state arsenic (As). a. 0 b. 1c. 2d. 3e. none of the above

Problem

There are _____ unpaired electrons in ground state arsenic (As). 

a. 0 

b. 1

c. 2

d. 3

e. none of the above

Solution

We are being asked how many electrons are unpaired in the ground-state electron configuration of Arsenic (As). To figure that out, let’s first write the electron configuration of a neutral (uncharged) As atom.


Ground-state means that Iron is in its lowest energy form (not in an excited state). 


Neutral element:       Atomic number = # protons = # of electrons


Neutral Arsenic (As):

• Atomic number = 33
• # of electrons = 33 e-


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