Presume if there is a G subshell in the Atomic structure, how many orbitals that subshell would have ?

A little more descriptive of a thread title would have been helpful here. Also, this sounds a little like a homework problem, so I’ll give a sketch of how to go about finding the answer:

[ul]

[li]An electron orbital in a hydrogen atom has four “quantum numbers” that uniquely denote it; they’re usually called n, l, m, and s.[/li][li]The letters S, P, D, F, G, H, etc. correspond to the quantum number n=1, 2, 3, 4, 5, 6, etc.[/li][li]For a given value of n, the quantum number l can take on any value from 0 to n-1.[/li][li]For a given value of l, the quantum number m can take on any value from -l to l.[/li][li]Finally, the quantum number s can be -1/2 or +1/2, regardless of the values of n, l, or m.[/li][/ul]

If you write out all the values of l, m, and s that are possible for the value of n that you’re looking at, you should be able to find the number of possible orbital. (Alternately, you can just write out the possible value of l & m and then multiply by 2 to account for the possibilities for s.)