#### Answer

x= 10.043

#### Work Step by Step

1
a) 5f
The 'f' sub-shell has 7 orbitals, where there would be 2 electrons in each orbital, resulting in 14 electrons in total.
2
b) 4p
The 'p' sub-shell has 3 orbitals, where there would be 2 electrons in each orbital, resulting in 14 electrons in total.
3
c) 5d
The 'd' sub-shell has 5 orbitals, in which there are 2 electrons in each orbital, totaling to 14 electrons in the whole 'd' sub-shell.
4
d) n=2
n (principle) describes the coefficient or shell number, which in this case is 2. The second shell includes 2 sub-shells-- 2s and 2p. 2s has 1 orbital and 2p has 3 orbitals, therefore the 2nd shell has 5 orbitals.