Read the following passage and with your own knowledge answer the following
questions;
In order to overcome the objections raised against Rutherford’s model of the atom,
Neil Bohr put forward the following postulates about the model of an atom.
Only certain special orbits known as discrete orbits of electrons are allowed
inside the atom.
a) Discrete orbits are also known as __________
b) Atomic mass of an element is the sum of number of protons and ______
ii) Calculate the average atomic mass of Chlorine if it exists commonly in two isotopes
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Answer:
In order to overcome the objections raised against Rutherford’s model of the atom,
Neil Bohr put forward the following postulates about the model of an atom.
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a) stationary orbits.
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. These orbits are associated with definite energies and are also called energy shells or energy levels.
b) the number of neutrons in an atom.
The mass number is the sum of the number of protons and the number of neutrons in an atom.
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