Which statement about the half-life of a radioactive sample is true? A. It is an exact measure of the decay of an individual atom.
B. It measures the tendency of a radioisotope to decay radioactively.
C. It is affected by the concentration of the radioactive substance that is present.
D. It can be calculated based on neutron number.

The correct answer is - B.  It measures the tendency of a radioisotope to decay radioactively.

Explanation:

The half-life of the radioactive sample is the time it takes to decay to its half amount of the unstable nuclei of its initial amount. It is radioactively decays to its half value or in simple words, it takes the time to decay an unstable nuclei to decay to its half value.

It can take milliseconds to million years to disintegrate the different unstable nuclei of a radioactive substance to disintegrate its half amount to a stable substance.

B. It measures the tendency of a radioisotope to decay radioactively.

Explanation:

Chem Hnrs EDGE 2021

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

personal, she chose to do it.