The fourth electron of Be atom will have which of the following quantum numbers?
Correct answer: C. 2,0,0,-1/2
- A. 1,0,0, 1/2
- B. 2,1,0,2,+1/2
- C. 2,0,0,-1/2
- D. 1,1,1, +1/2
Explanation
Be has the electronic configuration : 1s2,2s2 ,the fourth electron is present in 2nd shell so principle quantum number (n)=2,the fourth electron is present in s subshell so azimuthal quantum number(l)=0, magnetic quantum number(m) for l=0,spin quantum number(s) can either be + or -1/2.So the correct answer is 2,0,0,-1/2.
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