Recent questions and answers in Atomic Structure

Which one is the wrong statement? (a) The uncertainty principle is $\Delta E\times\Delta t\geq{h\over4\pi}$ (b) Half filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement. (c) ...

The calculated spin only magnetic moment of Cr2+ ion is: (1) 3.87 BM (2) 4.90 BM (3) 5.92 BM (4) 2.84 BM