Atomic Structure and Radioactivity - SS1 Physics Past Questions and Answers - page 3
Which atomic model introduced the concept of discrete energy levels for electrons?
Bohr Model
Quantum Mechanics
Rutherford Model
Dalton Model
According to the Bohr Model, electrons orbit around the nucleus in specific energy levels. Which statement best describes the energy levels?
The energy levels are continuous and can have any value.
The energy levels are fixed and do not change.
The energy levels are discrete and quantized.
The energy levels are determined by the number of protons.
Which atomic model incorporates the wave-particle duality of electrons?
Bohr Model
Quantum Mechanics
Rutherford Model
Dalton Model
According to Quantum Mechanics, what is the fundamental property that describes the motion of electrons?
Energy
Mass
Charge
Probability
Which model provides a more accurate description of electron behaviour and orbital shapes?
Bohr Model
Quantum Mechanics
Rutherford Model
Dalton Model
The Bohr Model of the atom successfully explains the spectral lines observed in the emission spectrum of which element?
Hydrogen
Helium
Carbon
Oxygen
In the Quantum Mechanical Model, what are the regions around the nucleus where electrons are most likely to be found called?
Orbits
Energy levels
Shells
Orbitals
Which model suggests that electrons do not follow a fixed path but rather exist in a cloud of probability around the nucleus?
Bohr Model
Quantum Mechanics
Rutherford Model
Dalton Model
The Bohr Model of the atom is most applicable to which type of atoms?
Small atoms with few electrons
Large atoms with many electrons
Noble gases
Transition metals
Explain the Bohr Model of the atom. How does it describe the behaviour of electrons in an atom?
The Bohr Model, proposed by Niels Bohr, describes the behaviour of electrons in an atom. According to this model, electrons orbit the nucleus in specific energy levels or shells. The electrons can transition between these energy levels by absorbing or emitting energy in the form of photons. The energy levels are quantized, meaning electrons can only occupy specific energy states. The model also suggests that electrons closer to the nucleus have lower energy levels, and as the distance from the nucleus increases, the energy levels increase. The Bohr Model successfully explains the emission spectrum of hydrogen and provides a basic understanding of atomic structure.