4.2 Quantum Theory of an Atom

The definition of 'ground state' is:

• The highest energy state of an atom or molecule

• The lowest energy state of an atom or molecule

• A state of matter at high temperature

• A state of matter at low pressure

A 'quantum number' is:

• a unique identifier for an electron in an atom

• a type of subatomic particle

• a measure of atomic mass

• a unit of energy

The 'de Broglie equation' is used to explain the wave-particle duality of matter. Which of the following is the correct expression for the de Broglie wavelength?

• λ = h/p

• λ = p/h

• λ = h + p

• λ = h - p

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NGSS.HS-PS4-3

The 'Heisenberg uncertainty principle' states that:

• the position and momentum of a particle cannot both be precisely determined at the same time.

• energy and time are unrelated in quantum mechanics.

• particles can exist in two places at once.

• the speed of light is constant in all inertial frames.

The quantum mechanical model of the atom is based on which of the following principles?

• Uncertainty Principle

• Bohr's Model

• Classical Mechanics

• Newton's Laws

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NGSS.HS-PS4-3

An atomic orbital is:

• a region of space where there is a high probability of finding an electron.

• a fixed path around the nucleus where electrons revolve.

• a positively charged particle in the nucleus.

• a type of chemical bond.

The principle quantum number is:

• a measure of the size of an orbital

• a measure of the energy of an electron

• a measure of the shape of an orbital

• a measure of the spin of an electron

The principle energy level is:

• a measure of the size and energy of an orbital

• the number of protons in an atom

• the number of neutrons in an atom

• the number of electrons in an atom

An energy sublevel is:

• a specific region within an energy level where electrons can be found

• the highest energy level of an atom

• a type of chemical bond

• a measure of the energy of a photon

The quantum mechanical model of the atom is:

• a classical model with defined orbits for electrons

• a model where electrons are described by probability clouds

• a model with fixed positions for electrons

• a model that does not include electron behavior