The maximum number of energy sublevels found in any energy level at ground state is:

the sublevels of the first four principal energy levels and the maximum number of electrons that the sublevels can contain are summarized in Table 5.1.

The maximum number of energy sublevels found in any energy level at ground state is one

Explanation:

The energy state in general can be specified by four quantum numbers:

1) n = principal quantum number = 1,2,3 ...

2) l = angular momentum where l = 0 ... n-1

where: l = 0 corresponds the 's' sublevel

l = 1, corresponds to the 'p'

l = 2, corresponds to the 'd' sublevel

3) m = magnetic quantum number which extends from - l ... + l

4) s = spin = + 1/2 or - 1/2

For the ground state n = 1 and l = 0 which corresponds to a single 's' sublevel.