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Question

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Please give me the reasons behind your answers (the ones that are NOT correct and why). for Example, third one is not correct because ML = -2,-1,0,1,2. which means 2 is incorrect, cause it can hold (Ml x 2 = 10 electrons). Which also means 4 is right because Ml = # of orbitals, or 5 ?

I ESPECIALLY dont know how to do the last one (#8).

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Consider the quantum numbers n = 4 and I = 2. Which of the following statements are correct regarding these quantum numbers? More than one may be correct. corresponds to a p-orbital can hold up to 4 electrons ml can only equal -1, 0, +1 has 5 orbitals ms can only equal plusminus 1 / 2 an electron with these quantum numbers could have an electron configuration of [Kr] 5s2 4d3 an electron at these quantum numbers has more energy than an electron at n = 5,l = 0 when the last electron in the ground state has these 8. quantum numbers, the atom is between Scandium and Zinc on the Periodic Table

Explanation / Answer

n= 4 and l= 2

as l=0 (s) , l=1 (p) , l=2 (d) orbitals so

n= 4 and l= 2 correspondsto 4d orbital

1 in incorrect

2 is incorrect as it can hold upto 10 electrons

3 is incorrect as ml = -2,-1,0 ,+1,+2

4 is correct as there are five d-orbitals

5 is correct as ms = +/- 1/2

6. is correct as last orbital in confg given is 4d

7. is correct

as lower the value of (n+l) lower is the energy of orbital

for n=4 , l=2    (n+l )   =   (4+2   =   6)

for n=5 ,l=0    (n+l) = 5+0   = 5

so

n=4 , l=2 has higher energy than n=5 , l=0

8 . is incorrect as when last electron has these quantum numbers the orbital is 4d

but from Sc to Zn the last orbital is 3d

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