Test on Atoms

Which of the following atoms has the lowest ionization potential?

Energy required for the electron excitation in Li⁺⁺ from the first to the third Bohr orbit is

In the nuclear fusion reaction, given that the repulsive potential energy between the two nuclei is −7.7 × 10⁻¹⁴ J, the temperature at which the gases must be heated to initiate the reaction is nearly [Boltzmann’s constant k = 1.38 × 10⁻²³ J/K]

The above is a plot of binding energy per nucleon E_b, against the nuclear mass M; A, B, C, D, E, F correspond to different nuclei. Consider four reactions :
(i) A + B → C + ε
(ii) C → A + B + ε
(iii) D + E → F + ε
(iv) F → D + E + ε
Where ε is the energy released? In which reaction is ε positive?

hydrogen atom is excited form ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be