Which of the following statements is true? A) We can determine the exact location of an electron if we know its energy. B) Ni has 2 unpaired electrons in its 3d orbitals. C) An electron in a 2s orbital can have the same n, l, and m_l quantum numbers as an electron in a 3s orbital. D) Only three quantum numbers are needed to uniquely describe an electron. E) In the building up of atoms, electrons occupy the 4f orbitals before the 6s orbitals.

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Ni (Nickel) has 2 unpaired electrons in its 3d orbitals. This is based on its electron configuration, which is [Ar] 3d^8 4s^2, and when the 3d orbitals are filled according to Hund's rule, two electrons remain unpaired.

Which of the Following Statements Is True