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Which particles that make up an atom are involved in nuclear reactions?

protons only

protons and neutrons

electrons only

electrons and neutrons

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A radioactive nuclide that is used for radiation therapy for cancer has 33 neutrons and a mass number of 60. Which is the correct symbol for this nuclide?

Superscript 27 subscript 60 upper C o.

Superscript 33 subscript 60 upper C o.

Superscript 60 subscript 33 upper C o.

Superscript 60 subscript 27 upper C o.

Consider the three equations below.Which statement do these reactions best support?

Beta decay occurs only in certain atoms.

Alpha decay occurs only in certain atoms.

Chain reactions play important roles in the process of nuclear fission.

Nuclear fusion plays an important role in making elements that are heavier than helium.

If an unshielded sample of radioactive material emits alpha particles, what effect will it have on a person sitting in the next room? (Assume the wall between rooms is composed of concrete.)

None, because the wall will block the radiation.

The radiation will travel through the person’s body.

None, because the radiation will bounce off the person’s body.

The radiation will be totally absorbed by the person’s body.

Which best describes what forms in nuclear fission?

two smaller, more stable nuclei

two larger, less stable nuclei

one smaller, less stable nucleus

one larger, more stable nucleus

Which type of reaction does this diagram represent?

a chain reaction that is caused by nuclear fission

a chain reaction that is caused by nuclear fusion

a decrease in energy that is caused by nuclear fission

an increase in energy that is caused by nuclear fusion

A large atom decays and emits a particle. After the reaction is complete, the atom’s mass has changed substantially. What kind of particle has most likely been emitted?

alpha particle

beta particle

positron

photon

Which best describes nuclear fusion?

A nucleus spontaneously splits and absorbs energy.

Two nuclei spontaneously combine and absorb energy.

A nucleus collides with a neutron and splits, releasing energy.

Nuclei combine to form a heavier nucleus, releasing energy.

The alpha decay of a radioactive nuclide (X) emits a He-4 nucleus and produces an isotope of . What is X?

Superscript 235 subscript 91 upper P a.

Superscript 235 subscript 93 upper N p.

Superscript 236 subscript 92 upper U.

Superscript 239 subscript 94 upper P u.

Consider the nuclear equation below.Which is the missing value that will balance the equation?

Which represents the balanced nuclear equation for the beta plus decay of C-11?

Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 5 upper B plus superscript 0 subscript plus 1 e.

Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 7 upper N plus superscript 0 subscript plus 1 e.

Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 7 upper N plus superscript 0 subscript negative 1 e.

Superscript 11 subscript 6 upper C right arrow superscript 11 subscript 5 upper B plus superscript 0 subscript negative 1 e.

After a radioactive atom decays, it is the same element that it was before with no measurable change in mass. Which kind of decay has occurred, and how do you know?

alpha decay because alpha particles have no mass

beta decay because this kind of decay cannot change one element into another

alpha decay because it creates a new isotope of the same element

gamma decay because photons have no mass

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