Quantum Theory

How many quantum numbers are needed to describe the energy state of an electron in an atom?

• 1
• 2
• 3
• 4

The set of orbitals that are dumbbell shaped and directed along the x, y, and z axes are called 

• d orbitals.
• p orbitals.
• f orbitals.
• s orbitals

The distance traveled between two successive peaks of a waves is the

• speed
• frequency
• wavelength
• energy

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A line spectrum is produced when an electron moves from one energy level

• into the nucleus.
• to another position in the same sublevel.
• to a higher energy level.
• to a lower energy level.

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If electrons in an atom have the lowest possible energies, the atom is in the

• ground state.
• inert state.
• excited state.
• radiation-emitting state.

According to the Bohr model of the atom, the single electron of a hydrogen atom circles the nucleus

• in specific, allowed orbits.
• in one fixed orbit at all times.
• at any of an infinite number of distances, depending on its energy.
• counterclockwise.

Which statement is NOT true about Bohr's Atomic Model?

• The electrons in an atom move in circular patterns

• The smaller the orbit, the lower the atomic energy is

• Bohr assigned a quantum number (n) to each energy level.

• The larger the orbit, the lower the atomic energy is.

What is the Heisenberg uncertainty principle?

• States that particles can exist in multiple states at the same time.

• Is a mathematical equation that describes the relationship between position and momentum.

• It only applies to large objects, not subatomic particles.

• It states that it is impossible to know the exact position and velocity/momentum of a particle.

What is the principal quantum number (n)?

• A negative integer representing the energy level or shell of atomic orbitals.

• A positive integer representing the energy level or shell of atomic orbitals.

• A decimal number representing the energy level or size of atomic orbitals.

• A letter representing the energy level or shell of atomic orbitals.

What does the quantum mechanical model describe about electrons?

• Electrons do not exist in energy levels or orbitals.

• Electrons are not affected by the nucleus of an atom.

• Electrons exist in specific energy levels or orbitals and treated as waves

• Electrons are not present in atoms.

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