Chapter 20 Nuclear Reactions

What are found in the nucleus of an atom?

• protons and electrons

• electrons and neutrons

• protons, neutrons, and electrons

• protons and neutrons

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Protons do not repel each other in the nucleus because of the ______

• weak force

• electric force

• strong force

• gravitational force

Ina radioactive nucleus, the electric force _____ the strong force.

• balances

• overpowers

• is overpowered by

• adds to

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All isotopes with atomic numbers over 84 are _____

• nonmetals

• radioactive

• metalloids

• always stable

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Elements larger than atomic number 93 _____.

• are completely stable

• must be made in a laboratory

• occur naturally

• are nonmetals

Isotopes have _______.

• the same number of protons, but a different number of neutrons

• the same number of neutrons, but a different number of protons

• the same number of protons, but a different number of electrons

• the same number of electrons, but a different number of protons

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Alpha particles contain ___________.

• two protons and two electrons

• two electrons and two protons

• two protons and two neutrons

• two electrons and two neutrons

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Radioactivity can be harmful and cause disease because it affects _________.

• air

• water

• cells

• blood

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The process in which an atom loses particles and becomes another element is known as _________.

• transmutation

• fission

• fusion

• chain reaction

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When a neutron turns into a proton in a nucleus, what sort of particle is emitted?

• alpha

• beta

• gamma

• photon

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