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Question

Which one of the following statements is true according to Rutherford's nuclear model of an atom?


  1. There is a positively charged centre in an atom called the nucleus.

  2. All the mass of an atom resides in the nucleus.

  3. The electrons revolve around the nucleus in well-defined orbits

  4. All of the above


Solution

The correct option is D

Rutherford Model of an atom: 

On the basis of Rutherford's experiment,

(1) An atom consist of positively charged, dense and very small nucleus containing protons and neutrons. The entire mass of an atom is concentrated in the nucleus.

(2) The nucleus is surrounded by negatively charged electrons. The electrons are revolving around the nucleus in circular paths at very high speed. These circular paths of the electrons are called orbits.

(3) An atom is electrically neutral because the number of protons and electrons is equal.

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