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Worksheetsquiz 3 sec 2
Total questions: 20
Worksheet time: 10mins
Who first introduced the uncertainty principle?
De Broglie
Dirac
Schrödinger
Heisenberg
Who established the quantum mechanical model of the atom?
Bohr
Dalton
Schrödinger
Heisenberg
Who created an equation that could describe the electron wave motion in the atom?
Heisenberg
Bohr
De Broglie
Schrödinger
According to Bohr’s atomic model, the electron. ….. to transfer from the first level K to the fourth level N
acquires a quantum
loses a quantum
acquires 4 quanta
loses 4 quanta
Each line in the spectral lines of lithium atom represents …....
the energy absorbed by the atom when it gains an electron
the energy absorbed by the atom when it loses an electron
the energy released when an electron transfers from a
lower energy level to a higher energy level
the energy released when an electron transfers from a higher energy level to a lower energy level
………. discovered that the determination of both the position and the momentum of an electron at the same time is practically impossible.
De Broglie
Heisenberg
Bohr
Rutherford
Which of the statements is considered an agreement between Bohr’s atomic model and modern atomic theory?
Electrons revolve around the nucleus in a certain pattern.
Electrons revolve around the nucleus in a region of space called orbitals.
An electron is a material particle that has wave properties.
Electrons revolve around the nucleus in a planar orbit.
Bohr's atomic model differs from that of Rutherford, this difference is obvious in Bohr’s postulate that the electron ...............
produces a spectral line when it loses a quantum.
is a negatively charged particle.
does not produce a spectral line when it loses a quantum.
revolves around the nucleus in certain orbits.
Which of the following statements is a Heisenberg’s modification to Bohr's atomic model?................
It is difficult to determine the position of the electron around the nucleus precisely.
Space regions between energy levels are not forbidden for the electrons.
The electron is a particle with wave properties.
Both the speed and the position of the electron can be determined precisely.
According to the wave-mechanical theory. ............
the electron has a mass and wave properties
the electrons are found in the orbitals.
the nucleus is very small compared to the atom.
the electrons are negatively charged
The modern atomic theory agrees with Rutherford’s model on that...............
the atom is not solid.
the electrons have wave properties.
it is impossible to determine the speed and the position of the electron together precisely.
there is a pattern according to which the electrons orbit the nucleus.
The spectral lines of the atom of any element indicate ..............
the number of electrons in the atom of this element.
the energy level where the electron is present.
the energy of the electron in the energy level.
the difference in energy between two energy levels
The electron in hydrogen atom which is excited to the fourth energy level ...
remains in the same new energy level.
returns to its ground state in one jump.
returns to its ground state in one jump or several successive jumps.
transfers to a higher energy level.
Which of the following is not among the drawbacks of Bohr's atomic model?
An electron is a negatively charged particle only.
An electron is a particle that moves in a circular planar orbit.
In the case of not gaining or losing energy, the atom is described to be stable.
It is possible to determine precisely both the location and speed of an electron at the same time.
Electrons are found in orbitals. What is the scientific development that resulted in the concept of orbitals?
The wave-mechanical theory
Bohr’s atomic model
The concept of the dual nature of electrons
The uncertainty principle
What is the drawback of Bohr’s model that was corrected by Heisenberg?
The electron is a negatively charged particle only.
It is possible to determine precisely both the location and the speed of an electron at the same time.
Electrons can acquire any amount of energy.
The electron is a particle moving in a circular planar orbit
Which of the following statements can best describe the electron cloud?
It is the region of space around the nucleus in which the electron probably exists in all dimensions.
It is a circular orbit where an electron moves around the nucleus.
It is the region of space around the nucleus in which there is a high probability of finding an electron in all dimensions.
It is the region of space around the nucleus in which the electron probably exists only at all distances.
Which of the following can be considered a result of solving Schrödinger's equation?
it becomes possible to define the regions of space around the nucleus where it is most probable to find the electron in each energy level.
It becomes possible to determine the allowed energy levels inside the atom
The concepts of electron clouds and orbitals were introduced to the movement of electrons around the nucleus.
All of the answers are correct
Which of the following is correct when the electron in an atom acquires a quantity of energy by heat or by electric discharge?
The electron jumps to a higher energy level and stays there.
The electron jumps temporarily to a higher energy level, then it returns to its original level with an emission of the same quantum of energy.
The electron jumps temporarily to a higher energy level, then it returns to its original level with an emission of a higher quantum of energy.
The electron jumps temporarily to a higher energy level, then it returns to its original level with an emission of a lower quantum of energy.
According to the modern atomic theory, which of the following is correcct?
The electron behaves as a wave only.
The electron behaves both as a material particle and as a wave
the electron behaves as a material particle only
The electron moves in a fixed circular orbit round the nucleus.
