An article about half-lives describes a parent isotope. what is a parent isotope?

the isotope that forms from the radioactive decay of a less stable isotope

the isotope that forms from the radioactive decay of a more stable isotope

an isotope that undergoes radioactive decay to form a less stable isotope

an isotope that undergoes radioactive decay to form a more stable isotope

Correct option is D.

Explanation:

A parent isotope is the one which undergoes decay in order to form 2 or more stable daughter isotopes.

Here, the parent isotope is radioactive in nature and radioactive substances are unstable. So in order to gain stability, Parent isotope undergoes radioactive decay to form more number of stable daughter isotopes.

the answer

explanation:

the capillary tube was too close to the bottom of the beaker.

the ruler may have moved.

water got into the capillary tube.

the temperature was not allowed to equilibrate in the 2-4 minutes.