A. Cu2+ , Ti3+

B. Mn2+ , Cu2+

C. Ti4+ , Cu2+

D. Ti3+ , Ni2+

Which of the following elements has least number of electrons in its M shell ?

The atomic numbers of elements X, Y and Z are 19, 21 and 25 respectively. The number of electrons present in the M shell of these elements follow the order

An electron is moving in Bohr\'s fourth orbit. Its de-Broglie wave length is X. What is the circumference of the fourth orbit

Which of the following pair of transition metal ions, have the same calculated values of magnetic moment

The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is (16/15)hr cm .What is the value of n<sub>2</sub> (R= Rydberg Constant)