Question

compare all proposed models of an atom​

Answer 1

Thomson's model of an atom. 1. An atom consists of a sphere of positive charge with negative charge electrons embedded in it

2. The positive and negative charge in atom are equal in magnitude due to which an atom is electrically neutral .

Rutherford's model of an atom.

1. The is a positive charge, highly densed centre in an atom called the nuclear. Nearly the whole mass of an atom resides in the nuclear.

2. The electrons revolve around the nuclear in circular paths.

Bohr's model of an atom.

1.Each energy levels is associated with the fixed amount of energy ,the shell nearest to the nuclear having minimum amount of energy .

2. There is no chance in energy of electrons as the keeping revolving in the same shell and the atom remains stable.

Answer 2

All proposed models of an atom are:-

• J.J Thomson -Since discharge tube experiments suggested the the presence of negatively charged particles in an atom which is neutral. J.J Thomson suggested that electrons are embedded in a sphere of positive charge. The negative and positive charges are equal in magnitude, as a result of which atom is electrically neutral.

• E. Rutherford- The gold foil experiments of Rutherford suggested that all the positive charge is located in a very small space which is 10 times the radius of an atom. Therefore, Rutherford gave a model in whiy electrons are revolving around the nucleus in orbits.

• Neils Bohr- To explain the stability of an atom and atomic spectra, Bohr suggested that electrons revolve around the nucleus in orbits which have fixed energy shells .There is a loss or gain energy of electron when it moves from one orbit to the other.

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