The Auf Bau Principle, Hund's rule, and the Pauli exclusion principle are used to determine the lowest energy electron configuration of an atom, called the ground state; any other possible configuration is higher in energy, an excited state.   Which of the following valence shell electron configurations are excited states?           5s   5px   5py   5pz   4dz2   4dx2-y2   4dxy   4dyz   4dxz   (1)   ­ up, down   ­up               up­   up­   (2)   up, down­ ¯             ­   ­up   ­up   (3)   ­ ­up, down           up ­ up ­ up ­   (4)   ­ ¯up, down   ­up   ­up   ­up             1, 2, and 3 (b) 1 and 4      (c) 2 only        (d) 4 only        (e) 3 only   answer is B. i need explanation.

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The Auf Bau Principle, Hund's rule, and the Pauli exclusion principle are used to determine the lowest energy electron configuration of an atom, called the ground state; any other possible configuration is higher in energy, an excited state.   Which of the following valence shell electron configurations are excited states?

   

 

 

 

5s

 

5px

 

5py

 

5pz

 

4dz2

 

4dx2-y2

 

4dxy

 

4dyz

 

4dxz

 

(1)

 

­ up, down

 

­up

 

 

 

 

 

 

 

up­

 

up­

 

(2)

 

up, down­ ¯

 

 

 

 

 

 

­

 

­up

 

­up

 

(3)

 

­ ­up, down

 

 

 

 

 

up

­

up

­

up

­

 

(4)

 

­ ¯up, down

 

­up

 

­up

 

­up

 

 

 

 

 

 

  • 1, 2, and 3 (b) 1 and 4      (c) 2 only        (d) 4 only        (e) 3 only

 

answer is B. i need explanation. 

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