Electrons in Atoms - Quantum Theory and the Atom

Multiple Choice

Who was responsible for the development of the planetary model of the atom?

• Niels Bohr

• Albert Einstein

• Ernest Rutherford

• Marie Curie

Multiple Choice

According to Bohr's atomic model, what happens to the energy of an electron as it moves further away from the nucleus?

• The energy increases

• The energy decreases

• The energy remains the same

• The energy becomes zero

Multiple Select

Which of the following statements are correct according to Bohr's atomic model?

• Electrons orbit the nucleus in specific energy levels.

• The lowest energy state of an atom is called the ground state.

• Orbit levels are assigned quantum numbers.

• Electrons can exist anywhere around the nucleus without restriction.

Fill in the Blank

Bohr assigned each orbit level a number called a ___.

Multiple Choice

What is the ground state of the hydrogen atom?

• When the electron is in the n=2 orbit

• When the electron is in the n=3 orbit

• When the electron is in the n=1 orbit

• When the electron is in the n=4 orbit

Multiple Choice

What must happen for the electron in a hydrogen atom to move to an excited state orbital?

• The atom must lose energy

• The atom must gain energy

• The atom must emit light

• The atom must split

Fill in the Blank

When an electron in a hydrogen atom releases energy, it goes back to a ___ energy orbit.

Multiple Choice

According to the formula ΔE = E_higher-energy orbit - E_lower-energy orbit, what does the energy change correspond to?

• The energy of the atom

• The energy of the photon emitted or absorbed

• The energy of the nucleus

• The energy of the electron only

Multiple Choice

Why did Bohr's model succeed in explaining the emission spectrum of hydrogen but fail with other elements?

• Because hydrogen has only one electron, making its spectrum simpler to model.

• Because Bohr's model could not explain the behavior of electrons in atoms with more than one electron.

• Because the energy levels in multi-electron atoms are affected by electron-electron interactions.

• All of the above.

Multiple Select

Which statements about standing waves on a harp string and electrons in circular orbits are correct?

• Both can only have whole number wavelengths.

• Both can only have half wavelengths.

• Harp strings can only have half wavelengths, while electrons in orbits can only have whole number wavelengths.

• Electrons in orbits can have any wavelength.

Fill in the Blank

Louis de Broglie proposed a 'fix' for the Bohr energy level model by introducing the concept of ___ associated with electrons.

Multiple Choice

Why can only whole number wavelengths exist in a circular orbit, according to the diagram and statement?

• Because only whole numbers fit perfectly in a circle, preventing destructive interference.

• Because electrons can only have integer values of energy.

• Because fractional wavelengths would result in destructive interference and are not allowed.

• Because the orbit must be a perfect circle.

Multiple Choice

If an electron is considered as a wavelength and is restricted to circular orbits of fixed radius, what are the possible outcomes?

• There can only be specific wavelengths, frequencies, and possible energies.

• There can be any wavelength, frequency, and energy.

• There can only be specific wavelengths, but any frequency and energy.

• There can only be specific energies, but any wavelength and frequency.

Fill in the Blank

Fill in the blank: According to the de Broglie equation, the wavelength (λ) of a particle is equal to Planck's constant divided by the product of the particle's mass and its ___.

Multiple Choice

Which scientist is associated with the formulation of the Uncertainty Principle, and what does this principle state about the measurement of particles?

• Werner Heisenberg; It is impossible to know both the position and velocity of a particle precisely at the same time.

• Erwin Schrödinger; It is impossible to know both the energy and mass of a particle precisely at the same time.

• Werner Heisenberg; It is impossible to know both the energy and mass of a particle precisely at the same time.

• Erwin Schrödinger; It is impossible to know both the position and velocity of a particle precisely at the same time.