Atomic Theory III | Chemistry | Quiz

Early quantum theory was based on the concept that

light behaves like particles rather than waves.

light behaves like waves rather than particles.

light behaves like both waves and particles.

light behaves like neither waves nor particles.
De Broglie’s work was significant in that it

established the wave property of light.

established the particle property of electrons.

established the wave-particle duality of light.

extended the wave-particle duality of light to electrons.
De Broglie’s hypothesis about the of wave-nature of electrons was confirmed when

Clinton Davisson and Lester Germer fired electrons at a piece of nickel.

de Broglie’s equation was solved.

a value was assigned to Planck’s constant.

Russian chemist Dmitri Mendeleev grouped elements together according to their observed properties.
Schrödinger’s equation

can be stated as F = ma.

describes how the motion of classical physical objects changes with changing conditions.

describes how the wave function of a quantum system changes over time.

was the first published statement that electrons could be found in specified, quantized orbits.
Solutions to the Schrödinger equation

can be used to describe the exact location of an electron around the atom.

can be interpreted as three-dimensional probability maps of where an electron may most likely be found around an atom.

rendered Bohr’s quantum idea obsolete.

confirmed that all electrons in a multi-electron atom were placed in the lowest energy quantum levels.
According to Werner Heisenberg’s uncertainty principle

as the certainty of knowing the position of an electron increases, the certainty of knowing the momentum of an electron also increases.

as the certainty of knowing the momentum of an electron increases, the uncertainty of knowing the position of an electron increases.

the position of an electron can be accurately pinpointed only if its momentum has been precisely determined.

the momentum of an electron can accurately describe only if its position has been precisely determined.
Researchers observed that a single atom could produce two different spectral lines in the presence of a magnetic field. What is significant about this observation?

This observation failed to fit a working model.

This happened as a result of ‘spin’.

A fourth quantum number was revealed as a result of this observation.

All of the answers are correct.
The Pauli exclusion principle states that

no two electrons in an atom can have the same set of four quantum numbers.

no two electrons can have the same first three quantum numbers.

no two electrons in an atom can have the same values for size and shape.

no two electrons can inhabit the same shell.