In nuclear reactions, changes occur to the

• positrons

• electrons

• nucleus

• electron shell

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NGSS.HS-PS1-8

A nuclear reaction occurs when the atom is

• ready to give away electrons

• stable

• in need of electrons

• unstable

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NGSS.HS-PS1-8

The largest radioactive particle that can be stopped by your skin is called a(n)

• positron

• beta particle

• alpha particle

• gamma particle

The smallest and highest energy type of nuclear radiation is known as a(n)

• alpha particle

• beta particle

• gamma particle

• positron

Radiation can be detected by a device known as a(n)

• radiation sniffer

• radiometer

• speedometer

• Geiger counter

One helium nucleus is the same as a(n)

• alpha particle

• beta particle

• gamma particle

• positron

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NGSS.HS-PS1-8

What is the half-life of this element?

• 5.2 billion years

• 1.3 billion years

• 3.9 billion years

• 2.6 billion years

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NGSS.HS-PS1-8

A scientist detected radiation escaping from a material encased in a thin metal box. What type of radiation did the scientist most likely detect?

• alpha particles

• beta particles

• gamma particles

• positrons

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NGSS.HS-PS1-8

All radioactive sources have a half-life.

Which statement about the half-life of a source is correct?

• It is half the time it takes for an atom to decay

• It is the length of time it takes for half of the original amount of the radioisotope to decay to another element.

• It is half the time for the radioactive source to become safe

• It is half the time it takes the activity of the source to decrease to zero

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NGSS.HS-PS1-8

The ability of an atom to emit, or give off, charged particles and energy from its nucleus is known as

• nuclear changes

• nuclear emissions

• radioactivity

• chemical reactions

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NGSS.HS-PS1-8