Structure of the Atom Quiz

Who discovered the presence of electrons in the atom?

• John Dalton

• J.J. Thomson

• E. Goldstein

• J. Chadwick

What is the charge on an electron?

• +1.6 × 10-19 C

• -1.6 × 10-19 C

• +1.673 × 10-24 gm

• -9.1 × 10-31 kg

Which experiment led to the discovery of protons?

• Cathode Rays Experiment

• Anode Rays Experiment

• Canal Rays Experiment

• α-ray Scattering Experiment

What is the charge on a proton?

• +1.6 × 10-19 C

• -1.6 × 10-19 C

• +1.673 × 10-24 gm

• -9.1 × 10-31 kg

Who discovered the presence of neutrons in the atom?

• John Dalton

• J.J. Thomson

• E. Goldstein

• J. Chadwick

Which atomic model proposed the presence of electrons inside a positive sphere?

• Thomson's Atomic Model

• Rutherford's Atomic Model

• Bohr's Atomic Model

• Quantum Mechanical Model

What were the observations made by Rutherford in his α-ray scattering experiment?

• Most of the α-particles passed through the gold foil undeflected

• Some of the α-particles deflected by the foil by small angles

• One out of every 12000 particles appeared to rebound

• All of the above

What did Rutherford conclude from his α-ray scattering experiment?

• Atom consists of predominantly empty space

• Atom contains a centrally placed positively charged nucleus

• Most of the space in an atom is empty

• All of the above

What is the major drawback of Rutherford's atomic model?

• Electrons revolve around the nucleus in well-defined orbits

• Electrons lose their energy and fall into the nucleus

• Atom is highly unstable

• All of the above

What assumption did Neil Bohr make in his atomic model?

• Only certain special orbits of electrons are allowed inside the atom

• Electrons do not radiate energy while revolving in discrete orbits

• Energy is emitted or absorbed by an atom only when an electron moves from one orbit to another

• All of the above