Q13 of 43 Page 26

The first model of an atom was given by

J.J. Thomson conducted an experiment in 1900. He identified in his experiment that the atom was not a simple, indivisible particle but contained at least one subatomic particle called electron.

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In a sample of ethyl ethanoate (CH3COOC2H5) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

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An atom with 3 protons and 4 neutrons will have a valency of

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