The following parameter is same for all hydrogen like atoms and ions in their ground state.
The following parameter is same for all hydrogen like atoms and ions in their ground state.
Radius of the orbit
Speed of the electron
Energy of the atom
Orbital angular momentum of the electron.
Solution
According to Bohr's postulate angular momentum of electron in an hydrogen atom or hydrogen like ion is
$L_1=\frac{n h}{2 \pi}$
As $\frac{h}{2 \pi}=$ constant, angular momentum depends only on $n$ and its value is same when $n=1$ for all electrons.