Which of the following parameters are the same for all hydrogen like atoms and ions in their ground state?

Which of the following parameters are not same for all hydrogen like atom and lons is their ground state ?

Consider the following parameters with regard to hydrogen like atoms: (1). Energy of the atom (2). Radius of electron orbit (3) Spin of the electron Which of the above are same for all hydrogen-like atoms and ions in n=1 state?

Select the correct statements for hydrogen like atoms or ions.

The energy of a hydrogen like atom (or ion) in its ground state is -122.4 eV. It may be

The energy of a hydrogen like atom (or ion) in its ground state is -122.4 eV. It may be

The speed of an electron in the orbit of hydrogen atom in the ground state is

The speed of an electron in the orbit of hydrogen atom in the ground state is

The radius of hydrogen atom, in the ground state is of the order of