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A valence electron from an arsenic atom might have an electron with the following set of quantum numbers in the ground state.
a. n= 4; L= 1; m1= 0; ms= +½
b. n= 4; L= 1; m1= 2; ms= â½
c. n= 3; L= 1; m1= 0; ms= +½
d. n= 5; L= 1; m1= â1; ms= â½
e. n= 4; L= 2; m1= +1; ms= +½

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Answer:A

Explanation:

Arsenic is a p-block non-metal in group 15. It is found in the 4th period with electron configuration [Ar] 3d10 4s2 4p3

The outermost electrons are 4s2 4p3. The quantum number that fits an electron in the 4p orbital is option A

Since n=4,l=1, m= -1,0,1 ms=±1/2

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