Which of the following conclusions could not be derived from Rutherford's $\mathrm{\alpha }$-particle scattering experiment?

1. Most of the space in the atom is empty

2. The radius of the atom is about 10^-10 m while that of nucleus is 10^-15 m

3. Electrons move in circular path of fixed energy called orbits

4. Electrons and the nucleus are held together by electrostatic forces of attraction

Which of the following statement is not correct about the characteristics of cathode rays?

1.They start from the cathode and move towards the anode

2. They travel in straight line in the absence of an external electrical or magnetic field

3. Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube

4. Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube

Which of the following properties of atom could be explained correctly by Thomson model of atom?

1. Overall neutrality of atom

2. Spectra of hydrogen atom

3. Position of electrons, protons and neutrons in atom

4. Stability of atom