quiz 3 sec 2

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