Question

Name the two elements which have been identified as radioactive substance with atomic number less than 83​

Answer 1

Answer:

Stable atoms have a binding energy that is strong enough to hold the protons and neutrons together. ... All elements with atomic numbers greater than 83 are radioisotopes meaning that these elements have unstable nuclei and are radioactive

Explanation:

In the case of atoms of elements with a mass greater than 82, the level of binding energy does not allow stability. The force of repulsion between the particles that constitute the nucleus makes the atoms split and atoms of new elements are formed as they try to reach a nuclear configuration which is stable