Isotope of cobalt is used _________.

Isotope of iodine is used _______.

Chemical properties of isotopes of an element are same, because of ______.

Physical properties of isotopes are different, because ________.

If an element occurs in nature in two isotopic forms, with masses 23 u and 24 u in the ratio of 1:1. Then what will be the average atomic mass of element?

Isotope of uranium is used _________.

Which of the following pairs are isobar?

Which of the following electronic configuration is of a metal?

Maximum number of electrons that can be accommodation in the outermost orbit of an element is _______.

Mass number of an element ‘X’, which have 20 number of protons and 20 number of neutrons.

Which of the following pairs have same number of electrons?

The postulate, “while revolving in discrete orbits the electrons do not radiate energy” has given by _______.

Rutherford selected goal metal, for his alpha particle scattering experiment, because _________.

Nuclear model of the atom was proposed by

Number of neutrons in the three isotopes of hydrogen (H, D, T) respectively are____.