Question

how many electrons in an atom with atomic number 105 can have ( n + l ) = 8

Answer 1

Hi
total electron is 105
it is dubnium
the outhermost shell is 5f^14,6d^3,7s^2

in case of 5f
n+l=5+3=8

for6d
6+2=8

7s
7+0=7

so n+l =8 is possible but not outermost shell

Answer 2

Explanation:

We are given that total number of electrons = 105

Therefore, the element is dubnium. The electronic configuration of the outermost shell of this atom would be $5f^{14}6d^37s^2$.

We are also given that n+l=8

So, for 5f shell, we know 5+3=8. So, the number of electrons in 5f shell is 14.  

For 6d, 6+2=8 and so we know that there are 3 electrons in the outermost shell.

The total number of electrons = 14 + 3 = 17