Which of the scientist were able to prove that atom is no longer non-divisible?

Which of the following is never true for cathode rays ?

The lightest particle is :

Neutron is discovered by

The number of neutrons in dipositive zinc ion with mass number 70 is  

In discharge tube experiment stream of negatively charged particles travel from  

While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation ? 

Which is the correct schematic representation of the graph of black body radiation.

Which of the rays are not deflected by the electric and magnetic field?

An element has atomic number 11 and mass number 24. What does the nucleus contain?

Nucleons are

Atoms with same mass number but different atomic numbers are called

Which of the following pairs will have same chemical properties ?

What is the difference between two species if one has atomic mass = 14 and atomic number = 7 whereas the other has atomic mass = 14 and atomic number = 6 ?

The ideal body, which emits and absorbs radiations of all frequencies, is called a black body and the radiation emitted by such a body is called

If r is the radius of the first orbit, the radius of n^th orbit of H-atom is given by

Heisenberg's uncertainity principle is applicable to

The orientation of an atomic orbital is governed by

What will be the sum of all possible values of l and m for n = 5 ?

The following quantum numbers are possible for how many orbital(s) n = 3, l = 2, m = +2 ?

The order of filling of electrons in the orbitals of an atom will be 

Which of the following electronic configuration of d-orbital will have highest affinity for gaining an electron?

The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of the species is