Atomic Theory Quiz

Who is known as the father of atomic theory?

• Rutherford

• Dalton

• Thomson

• Bohr

According to Dalton’s Atomic Theory, atoms of the same element:

• Have different masses

• Have identical masses and properties

• Can be created and destroyed

• Are divisible

The first model of atom with electrons embedded in a positive sphere was proposed by:

• Rutherford

• Thomson

• Bohr

• Chadwick

The “plum pudding model” is also called:

• Dalton’s model

• Rutherford’s model

• Thomson’s model

• Bohr’s model

Rutherford’s α-particle scattering experiment led to the discovery of:

• Proton

• Electron

• Nucleus

• Neutron

Most of the α-particles passed through the gold foil undeflected because:

• Atoms are empty inside

• Atoms are solid throughout

• Nucleus is large

• Electrons are very heavy

In Rutherford’s experiment, very few α-particles were deflected at large angles. This proved that:

• Electrons are negative

• Nucleus is very small and dense

• Atom is indivisible

• Neutrons are present

Rutherford’s model of atom failed to explain:

• Existence of nucleus

• Stability of atom

• Positive charge in nucleus

• Presence of electrons

Bohr’s model of atom explained:

• Stability of atoms

• Circular motion of planets

• Nature of cathode rays

• Existence of neutrons

In Bohr’s model, electrons revolve in:

• Random orbits

• Definite orbits of fixed energy

• Elliptical paths

• Inside the nucleus