Exploring Atomic Models

What is the main postulate of Dalton's Atomic Theory?

• All matter is made of indivisible atoms.

• All matter is composed of molecules.

• Atoms can be created and destroyed.

• All atoms of an element are identical in mass.

How did Dalton describe atoms in his theory?

• Atoms are indivisible particles that make up all matter.

• Atoms can be created and destroyed in reactions.

• Atoms are large and complex structures.

• Atoms are made up of smaller particles called molecules.

What was the significance of Thomson's Plum Pudding Model?

• It suggested that electrons are the only components of an atom.

• It introduced the concept of electrons within a positively charged medium, challenging the notion of indivisible atoms.

• It proposed that atoms are indivisible and uniform in structure.

• It established the existence of protons as the primary atomic particle.

What experiment did Thomson use to propose his model?

• Vacuum chamber experiment

• Photoelectric effect experiment

• Cathode ray tube experiment

• Magnetic field experiment

What did Rutherford's Gold Foil Experiment demonstrate about the atom?

• The atom has a large nucleus with electrons densely packed around it.

• The atom is a solid mass with no empty space.

• The atom has a small, dense nucleus surrounded by mostly empty space.

• The atom consists only of protons and neutrons without any empty space.

What was the unexpected result of Rutherford's experiment?

• The identification of electrons.

• The discovery of the atomic nucleus.

• The observation of neutron particles.

• The confirmation of the plum pudding model.

How did Rutherford's findings change the understanding of atomic structure?

• Rutherford discovered that electrons are located in the nucleus of the atom.

• Rutherford's experiments showed that atoms are indivisible and uniform throughout.

• Rutherford's findings confirmed the plum pudding model of atomic structure.

• Rutherford's findings revealed that atoms have a dense nucleus, changing the atomic model from the plum pudding model to the nuclear model.

What are the key features of Bohr's Model of the atom?

• Electrons are located in a cloud around the nucleus.

• Energy levels can be continuously varied without restrictions.

• Key features of Bohr's Model include quantized energy levels, fixed electron orbits, and energy transitions during electron movement.

• Atoms have no fixed energy levels.

How does Bohr's Model explain the emission spectra of elements?

• Bohr's Model states that electrons can exist in any energy level without restrictions.

• Bohr's Model explains emission spectra through electron transitions between quantized energy levels, emitting photons of specific wavelengths.

• Emission spectra are caused by the collision of atoms in a gas.

• Electrons emit energy only when they are at rest.

What was the main limitation of Bohr's Model?

• It cannot accurately describe multi-electron atoms and does not incorporate quantum mechanics.

• It accurately describes the behavior of hydrogen atoms.

• It was the first model to explain chemical bonding.

• It includes the concept of wave-particle duality.