What are the radioactive isotopes?

Answer 1

radioactive isotopes are isotopes with irregular nuclear composition, it emits energy due to decay of atomic nucleus.

Answer 2

More than 3 000 isotopes are known today; see the link below for a quasi-complete list.

Answer 3

They are radioactive isotopes An element has a characteristic number of protons (P) in its nucleus.

Atoms of the element may have various numbers of neutrons (N) in the nucleus, typically close to P. For each element, we can gather naturally occurring samples and measure the number of neutrons N found in the nuclei, and find the average. The mass of each atom in the sample is roughly P+N.

In the sample, one value of N will be predominant, with other numbers (other atomic masses) being less common, and typically heavier. They are less common because they are less stable, and are likely to break down (emitting radioactive particles) into other isotopes. If two atoms of an element have different atomic masses (different N's), then we call them isotopes of the element. The most stable isotope of an element (the longest-lived isotope) will be the one mostly commonly occurring in nature, as other isotopes will tend to break down and become rarer.

A radioisotope is an unstable isotope of an atom with a short enough half-life to cause measurable amounts of radioactive particles to be emitted.

Answer 4

the isotopes of some element with atomic number z<82 areb called radio isotopes....

Answer 5

unstable atoms bye don