Bohr correctly proposed that the energy and radii of the orbits of electrons in atoms are quantized, with energy for transitions between orbits given by ∆E = hf = Ei − Ef, where ∆E is the change in energy between the initial and final orbits and hf is the energy of an absorbed or emitted photon.
- 1 What did Bohr’s model solve?
- 2 What was Bohr’s model of a hydrogen atom as a result?
- 3 What was the conclusion of Bohr’s model?
- 4 What did Bohr’s model of the atom suggest?
- 5 When did Bohr propose his model of the atom?
- 6 Why was the Bohr model replaced?
- 7 What does the Bohr model represent?
- 8 How does the Bohr model of the hydrogen atom explain the hydrogen emission spectrum?
- 9 Why is the Bohr model for the hydrogen atom referred to as the solar system model?
- 10 How did Bohr explain the stability of an atom?
- 11 How did Bohr prove that an atom must exist?
What did Bohr’s model solve?
In 1913 Bohr proposed his quantized shell model of the atom (see Bohr atomic model) to explain how electrons can have stable orbits around the nucleus. The energy of an electron depends on the size of the orbit and is lower for smaller orbits. Radiation can occur only when the electron jumps from one orbit to another.
What was Bohr’s model of a hydrogen atom as a result?
Bohr’s model of the hydrogen atom is based on three postulates: (1) an electron moves around the nucleus in a circular orbit, (2) an electron’s angular momentum in the orbit is quantized, and (3) the change in an electron’s energy as it makes a quantum jump from one orbit to another is always accompanied by the
What was the conclusion of Bohr’s model?
According to Bohr Atomic model, a small positively charged nucleus is surrounded by revolving negatively charged electrons in fixed orbits. He concluded that electron will have more energy if it is located away from the nucleus whereas the electrons will have less energy if it located near the nucleus.
What did Bohr’s model of the atom suggest?
In 1913, Bohr suggested that electrons could only have certain classical motions: Electrons in atoms orbit the nucleus. The electrons can only orbit stably, without radiating, in certain orbits (called by Bohr the “stationary orbits”) at a certain discrete set of distances from the nucleus.
When did Bohr propose his model of the atom?
In 1913, Niels Bohr proposed a theory for the hydrogen atom, based on quantum theory that some physical quantities only take discrete values.
Why was the Bohr model replaced?
However, the model was misleading in several ways and ultimately destined for failure. The maturing field of quantum mechanics revealed that it was impossible to know an electron’s position and velocity simultaneously. Bohr’s well-defined orbits were replaced with probability “clouds” where an electron is likely to be.
What does the Bohr model represent?
The Bohr model shows the atom as a central nucleus containing protons and neutrons with the electrons in circular orbitals at specific distances from the nucleus. These orbits form electron shells or energy levels, which are a way of visualizing the number of electrons in the various shells.
How does the Bohr model of the hydrogen atom explain the hydrogen emission spectrum?
Bohr’s model explains the spectral lines of the hydrogen atomic emission spectrum. While the electron of the atom remains in the ground state, its energy is unchanged. When the atom absorbs one or more quanta of energy, the electron moves from the ground state orbit to an excited state orbit that is further away.
Why is the Bohr model for the hydrogen atom referred to as the solar system model?
This picture was called the planetary model, since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as the nucleus about which a single electron moves.
How did Bohr explain the stability of an atom?
Niels Bohr explained the stability of the atoms through the concept of revolution of electrons in different energy levels. When it gains energy, it jumps from a lower energy level to a higher energy level, and when it loses energy it comes down from a higher energy level to a lower energy level.
How did Bohr prove that an atom must exist?
Niels Bohr suggested that electrons in an atom were restricted to specific orbits and has a fixed boundaries around the atom’s nucleus. As a result, we say that the energies of the electrons are quantized.