The elements of group 15 such as nitrogen, phosphorus, arsenic and antimony have atoms in the ground state that have three half filled orbitals.
The electronic configuration of the group 15 elements all end is ns2np3. They have a total of five outermost electrons.
Even though the question is incomplete, we know that only elements of group 15 have three orbitals that are exactly half filled. These are the p orbitals that contain only one electron each instead of two.
Any of the group 15 elements listed above fits this description.
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