The answer option which is not a possible sublevel is: C. 3f.
An atom is the smallest, indivisible unit made up of matter and it forms all chemical elements. Therefore, an atom is mainly considered as the fundamental building blocks of matter, and as such determines the structure of any chemical element.
In Chemistry, an atom is made up of three (3) distinct particles;
A sublevel can be defined as an energy level that is associated with the electrons found outside the atomic nucleus.
In Chemistry, there are four (4) types of sublevel and these includes:
I. s orbital (sublevel): it has one (1) orbital i.e 1s.
II. p orbital (sublevel): it has three (3) orbitals.
III. d orbital (sublevel): it has five (5) orbitals.
IV. f orbital (sublevel): it has seven (7) orbitals.
In the third (3rd) energy level, there are only three (3) sublevels and these are; s, p and d sublevels.
Hence, there isn't a f sublevel in the third (3rd) energy level and as such 3f is not a possible sublevel.
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