Question

Which of the following correctly describes the Bohr model of atom?

A) Electrons are embedded in a positively charged substrate.
B) Electrons orbit nucleus in orbits that have set sizes and quantized energies.
C) All matter is composed of very small indivisible particles, called atoms.
D) A central nucleus is surrounded by electrons moving randomly in a probability cloud.

Answer 1

The Bohr model of the atom describes the atom as a central nucleus surrounded by electrons in circular orbits at specific distances from the nucleus. These orbits are called electron shells or energy levels, and the model explains the phenomenon of atomic emission spectra of hydrogen.

Step-by-step explanation:

The Bohr model of the atom, proposed by Niels Bohr in 1913, describes the atom as a central nucleus surrounded by electrons in circular orbits at specific distances from the nucleus. These orbits are called electron shells or energy levels, designated by the symbol 'n'. The model suggests that the electrons can only occupy certain regions of space, and the energy of an electron in a particular orbit is given by a mathematical formula.

Unlike the earlier model proposed by Rutherford, the Bohr model explains the phenomenon of atomic emission spectra of hydrogen. However, it is important to note that the assumption of circular orbits and the concept of quantized energy levels has been superseded by modern quantum mechanics.