GK/GS Explorer

01. According to Bohr's model of an atom, electrons move in specific orbits called: a) Energy orbits b) Quantum orbits c) Stationary states d) Angular orbits Answer: c) Stationary states Explanation: Bohr proposed that electrons revolve around the nucleus only in certain selected circular paths called stationary states or orbits. These orbits are associated with definite energies and are also known as energy levels or quantum levels. 02. Which principle of Bohr's model states that only certain orbits are permitted in which angular momentum of the electron is a whole number multiple of h/2π? a) Stationary principle b) Quantized energy levels c) Angular momentum quantization d) Radiation emission principle Answer: c) Angular momentum quantization Explanation: Bohr's model introduced the principle of angular momentum quantization, stating that only specific orbits are allowed where the angular momentum of the electron is a whole number multiple of h/2π, where 'h' is Pl

Bohr's Model of an Atom, proposed by Niels Bohr in 1913, revolutionized the understanding of atomic structure and addressed the limitations of Rutherford's model. It was based on the principles of quantized energy levels and angular momentum. The important postulates are: 01. Electrons Move in Specific Orbits: The electrons revolve round the nucleus only in certain selected circular paths called orbits. These orbits are associated with definite energies and are called energy shells or energy levels or quantum levels. These are numbered as 1, 2, 3, 4 etc. (starting from the nucleus) or designated as K, L, M, N..., etc. 02. Radiation Emission and Absorption: As long as an electron remains in a particular orbit, it does not lose or gain energy. This means that energy of an electron in a particular path remains constant. Therefore, these orbits are also called stationary states. Electrons can move between different orbits by either absorbing or emitting photons of electromagneti