Rutherford's Model of an Atom

Q.

Almost the entire mass of an atom is concentrated in

1. Protons

2. Electrons

3. Neutrons

4. Nucleus

Q.

In $\alpha$-ray scattering experiment,

1. $\alpha$-rays were deviated from their path due to attraction by the electrons

2. gold foil is used since the number of electrons are more in gold atoms

3. gold foil is used to prevent the penetration of $\alpha$-particles

4. $\alpha$-particles are used because they are positively charged and have mass

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> What were the drawbacks of Rutherford's model of an atom?

Q.

Which of the following letters were used in the Niels Bohr model of the atom for representing the orbits or shells?

1. A, C, I, J

2. K, L, M, N

3. A, B, C, D

4. E, F, G, H