Good morning can you help me with my question please and answer it in english

a)
An isotope refers to atoms of the same element that have the same number of protons (atomic number) but different numbers of neutrons, resulting in different mass numbers.

b)
Two uses of radioactive isotopes are:

1. Medical applications: Radioactive isotopes are used as tracers for diagnosing diseases (e.g., imaging organs) and in radiotherapy for treating cancer.
2. Carbon dating: Carbon-14 is used to determine the age of archaeological artifacts and geological samples.