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Write down the quantum number for the outermost and the highest energy electron in casE of zinc.

Write down the quantum number for the outermost and the highest energy electron in casE of zinc.

Grade:12

1 Answers

Adil Khan
askIITians Faculty 62 Points
7 years ago
In ZINC
Zn atom : 1s22s22p63s23p63d104s2

exceptional EC due to full filled stability of full filled d orbital. Due to exchange energy of electrons and symmetry of d orbital


Therefore the last (outermost) electrons of Zn are located in 4s orbital.

Now, the quantum numbers:

Principal quantum number describes the shell of the electron.
n = 4

Azimuthal quantum number describes the subshell of the electron. Since we specify the e- in s-subshell,
l = 0

Magnetic quantum number describes the type of the orbital of the electron. The e- is in s orbital, therefore,
m = 1
Spin quantum number)

Each orbital can hold maximum 2 e- with opposite spins. These are represented as +1/2 and -1/2.
Since, Zn has 2e- in its outermost shell, one of them will have
s = +1/2 and the other s = -1/2.

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