According to Bohr's atomic theory, the correct statement is Kinetic energy of electron is ∝ Z²/n². Option A
According to Bohr's atomic theory, the kinetic energy of an electron is equal to the square of its main quantum number (n) divided by the square of its atomic number (Z).
The idea that electrons orbit the nucleus at particular quantized energy levels transformed our understanding of atomic structure. The relationship shown in option (A) suggests that the electron's kinetic energy increases with increasing atomic number or decreasing main quantum number.
This foundational idea formed the foundation for current atomic theory and made a vital early contribution to the development of quantum mechanics.