Model Chemistry

According to the Bohr model of the atom, which particles are allowed to exist in any one of a number of energy levels?

• electrons

• protons

• neutrons

• Both (b) and (c)

The line-emission spectrum of an atom is caused by the energies released when electrons

• “jump” from a lower energy level to a higher energy level.

• “jump” from a higher energy level to a lower energy level.

• “jump” from the ground state to an excited state.

• None of the above

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Because excited hydrogen atoms always produced the same line-emission spectrum, scientists concluded that hydrogen

• has no electrons.

• does not release energy.

• releases energy of only certain values.

• can exist only in the ground state.

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Which color of light in the visible spectrum has the longest wavelength?

• yellow

• red

• green

• blue

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A quantum of energy is the

• frequency of electromagnetic energy given off by an atom.

• wavelength of electromagnetic energy gained by an atom.

• minimum quantity of energy that can be lost or gained by an atom.

• continuous spectrum of energy given off by an atom.

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Bohr’s model correctly explains the spectra of atoms with how many electron(s)?

• one

• two

• three

• four or more

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A form of energy that exhibits wave behavior as it travels through space is

• microwave radiation.

• ultraviolet radiation.

• infrared radiation.

• All of the above

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In the equation c = lv, c represents

• the wavelength.

• the wavelength.

• the speed of light.

• Planck’s constant.

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The process of an atom releasing energy when it moves to a lower energy state is called

• absorption.

• emission.

• translation.

• regression.

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In the Bohr model of the atom, in which orbit is an electron in its lowest energy state?

• in the orbit closest to the nucleus

• in the orbit farthest from the nucleus

• in the electron cloud

• midway between two orbits