Q14 of 37 Page 54

For the following statements, write T for true and F for false:

J. J. Thomson proposed that the nucleus of an atom contains only nucleons.

False.

J,J Thomson proposed the model of an atom in which the atom consisted of a positively charged sphere. The electrons are embedded in the sphere. The negative and the positive charges are equal in magnitude.


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12

If Z = 3, what would be the valency of the element? Also name the element.

 13

Composition of the nuclei of two atomic species X and Y is given as under:

X Y


Protons = 6 6


Neutrons = 6 8


Give the mass numbers of X and Y. What is the relation between the two species?

 14

For the following statements, write T for true and F for false:

A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.

 14

For the following statements, write T for true and F for false:

The mass of an electron is about 1/2000 times that of a proton.