MODELS OF ATOM

Who proposed the existence of discrete energy levels for electrons in an atom, forming electron shells?

• Niels Bohr

• Ernest Rutherford

• John Dalton

• J.J. Thomson

Who discovered the nucleus of the atom through the gold foil experiment?

• J.J. Thomson

• Niels Bohr

• John Dalton

• Ernest Rutherford

According to the Planetary model of an atom, electrons orbit the nucleus much like planets orbit the sun. Who proposed this model?

• Ernest Rutherford

• Niels Bohr

• J.J. Thomson

• John Dalton

Who developed the idea that electrons can only occupy certain fixed energy levels or orbits around the nucleus?

• John Dalton

• Ernest Rutherford

• Niels Bohr

• J.J. Thomson

How does the Quantum Mechanical model differ from Rutherford's model of the atom?

• It incorporates the concept of electron clouds rather than fixed orbits.

• It suggests that electrons are evenly distributed throughout the atom.

• It proposes the existence of a positively charged nucleus.

• It describes electrons as particles orbiting the nucleus.

Which model of the atom suggests that electrons are embedded within a positively charged "pudding-like" sphere?

• Plum Pudding model

• Billiard ball model

• Rutherford's model

• Modern model of atom

In what way did the failure of the Planetary model to explain certain atomic phenomena contribute to the development of the Quantum Mechanical model?

• By introducing the concept of electron orbitals.

• By confirming the existence of discrete energy levels.

• By suggesting that electrons move in fixed paths around the nucleus.

• By proposing the existence of a positively charged nucleus.

According to Rutherford's model of the atom, where is most of the mass of the atom located?

• In the nucleus

• In the electron shells

• Equally distributed throughout the atom

• In the space surrounding the nucleus

The modern model of the atom states that electrons do not move in fixed orbits but exist in probability clouds around the nucleus. Who contributed significantly to the development of this model?

• Albert Einstein

• Erwin Schrödinger

• Max Planck

• Marie Curie

The Plum Pudding model/raisin bread model of the atom was proposed as an improvement to which earlier model?

• Billiard Ball model

• Planetary model of an atom

• Rutherford's model

• Modern model of atom