Structure of th...

How many sub-atomic particles are present in an $\alpha$- particle used in Rutherford's scattering experiment?

Energy of the third orbit of Bohr's atom is:

Which of the following statements is incorrect regarding Rutherford's model of atom?

The radius of $He^+$ ion is $x\ \mathring{A}$  in its ground state. The radius of $Li^{2+}$ ion in the ground state ($\mathring{A}$ ) is:

Bohr's theory can be applied to determine the?

The radius of the hydrogen atom in the ground state is $0.53 {\mathring A}$, the radius of $L{i^{2 + }}$ in a similar state is____.

Ionization energy of ${He}^{+}$ is $19.6\times {10}^{-18}J{atom}^{-1}$. The energy of the first stationary state ($n=1$) of ${Li}^{2+}$ is

The ratio of the energy of the electron in the ground state of hydrogen to the electron in first excited state of $Be^{3+}$ is 

Valency expresses:

In a hydrogen like sample electron is in 2nd excited state,the energy of the 4th state of this sample is -13.6 eV,then the incorrect statement is: