Maximum number of electrons in a subshell of an atom is determined by the following

When an electron of charge e and mass m moves with a velocity v about the nuclear charge Ze in circular orbit of radius r, the potential energy of the electrons is given by

The electron was shown experimentally to have wave properties by

In the photoelectron emission, the energy of the emitted electron is

Electronic configuration of calcium atom can be written as

If r is the radius of the first orbit, the radius of nth orbit of H-atom is given by

The de-Broglie wavelength of a particle with mass 1g and velocity 100 m/s is

The electronic configuration of Cu (atomic number 29) is

If ionisation potential for hydrogen atom is 13.6eV, then ionisation potential for He⁺ will be

In hydrogen atom, energy of first excited state is -3.4 eV.  Then, KE of same orbit of hydrogen atom is