Bohr’s model of the hydrogen atom. a) State the three postulates
underlying Bohr’s theory of the hydrogen atom. [3 marks] The radius
of an electron orbiting the nucleus is given by r = 0h 2 πme e 2 n
2 , where me is the electron mass, e the electron charge and 0 the
vacuum permittivity. b) Calculate the Bohr radius of a hydrogen
atom in an excited state of n = 2. [1 mark] c) By considering the
sum...
1) Describe Bohr’s quantum model of the atom.
2) Derive expressions for the energies and radii of an electron
in the hydrogen atom.
3) Discuss experiments that confirmed the existence of quantized
atomic energy levels.
Explain Bohr’s Theory of the Hydrogen Atom. When a hydrogen
atom does absorbs or emits radiant energy? What kinds of spectrum
is created when we observe the emission and absorption of radiant
energy from a hydrogen atom? What significance these spectra
have?
Evaluate the Bohr model of the atom. (a) What two key features of the atom did the Bohr model fail to explain? (b) How did quantum theory explain these features?
a) Describe the Democritian model for the atom.
b) Describe the Thomson model for the atom. What experiment led
to its formulation?
c) Describe the Rutherford model for the atom. What experiment
led to its formulation?
d) Describe the Bohr atom. What experimental evidence led to its
formulation?
Describe the Bohr model of the atom, the assumptions
is it based on, and how it relates to the characteristic emission
spectra from discharge tubes containing atoms such as sodium neon.
Include diagram.
Describe the Bohr model of the hydrogen atom with the aid of a
sketch and an equation for the allowed state energies for which the
ground state energy is -13.61 eV. Define all variables used. [2
marks] (b) De Broglie’s equation defines a wavelength for a
particle, yet in the view of quantum mechanics, matter is in the
form of particles and not waves. Explain how this apparent paradox
is resolved by carefully defining the variables in de Broglie’s
equation....