All of the orbitals in a given subshell have the same value as the quantum number.
a) principal
b) spin
c) magnetic
d) a and b
e) b and c

A.

Explanation:

The quantum numbers that are used in the identification of an electron are n, l, m, and s.

n= principle quantum number

l= azimuthal quantum number

m= magnetic quantum number

s= spin quantum number

All the orbitals in a given subshell have the same value of n(principle quantum number) and l( azimuthal quantum number). Thus, the correct option is A.  

1/0.14nm = 10^10/1.4 a lot