which of the following statements is true? responses the exact location of an electron can be determined if we know its energy. the exact location of an electron can be determined if we know its energy. ni has two unpaired electrons in its 3d orbitals. ni has two unpaired electrons in its 3 d orbitals. in the buildup of atoms, electrons occupy the 4f orbitals before the 6s orbitals. in the buildup of atoms, electrons occupy the 4 f orbitals before the 6 s orbitals. an electron in a 2s orbital can have the same n, l, and ml quantum numbers as an electron in a 3s orbital. an electron in a 2 s orbital can have the same n , l , and m l quantum numbers as an electron in a 3 s orbital. only three quantum numbers are needed to uniquely describe an electron. only three quantum numbers are needed to uniquely describe an electron.