Q14 of 37 Page 54

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.

False.

Neutrons are present in the nucleus of all atoms, except hydrogen. It is subatomic particle which had no charge and a mass nearly equal to that of a proton.


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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:

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

 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.

 14

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

A radioactive isotope of iodine is used for making tincture iodine, which is used as a medicine.