One type of radioactive device that indicates the intensity of radiation with a clicking sound that increases in frequency as more radiation is present is a(n) ____.

A helium nucleus with two protons and two neutrons is called a(n) ____.

Negatively charged particles emitted from a nucleus at a high speed are ____.

The three types of nuclear radiation in increasing order of penetrating power are ____.

The stability of an isotope nucleus depends on the ____.

Radioactive tracers are useful in ____.

Both a fusion reaction and a fission reaction ____.

Neutrons released in a fission reaction can strike other nuclei and cause ____.

For which of the following problems would a scientist most likely use carbon-14?

Thorium-234 has a half-life of 24 days. If you started with a 100-g sample of thorium-234, how much would remain after 48 days?

If a source of radiation is placed near ____ cells, atoms in the cells can be ionized and can die or stop growing.

When the ____ is not large enough to hold a nucleus together tightly, the nucleus can become radioactive.

The ratio of protons to neutrons in stable isotopes of the lighter elements tends to be approximately

The most difficult radiation to block out is _____

A particle released during the fission of uranium-235 is a(n) _____

A(n) _____ is a high energy electron.

How much hydrogen-3 will remain after 60 years if the original sample had a mass of 80.0 g and the half-life of hydrogen-3 is 12 years?

When one large nucleus is split into two smaller nuclei, the process is nuclear _____

Two or more nuclei combine to form one larger nucleus in the process of nuclear _____

The radioisotope iodine-131 is used to determine the health of the thyroid gland. Iodine-131 is an example of _____

Unstable nuclei can break apart spontaneously, changing the identity of the _____

Radiations that produce an electric current can be measured with what type of counter?

Alpha particles have a _____ charge.

Beta particles have a _____ charge.

Gamma rays have a _____ charge.