Question

how many 3d electrons can have spin quantum no. -1/2

Answer 1

for

3d-->

n =(shell) =3

l =(sub shell) =2 = n-1

m(orbitals)= -2 , -1, 0 , +1, +2 = -l to +l including 0
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so a total of 5 ORBITALS
each orbital has electrons of spin +1/2 and -1/2 are possible..

so... we will have a total of 5electrons with spin +1/2 and a total of 5electrons with spin -1/2
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so...

number of 3d electrons that can have spin quantum no. -1/2 is 5
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hope it helps you...
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