1.

All of the isotopes of elements with atomic numbers of 84 and higher are radioactivebecauseA) strong repulsions between their electrons make them unstableB) strong repulsions between the protons make their nuclei unstableC) strong repulsions between their nuclei make them unstableD) their mass number is larger than their atomic numberE) strong repulsions between the neutrons make their nuclei unstable

Answer»

Strong REPULSION between their protons makes their nuclei unstable.

Option (B) is correct.

Explanation:

  • ATOMS having the same number of electrons and protons but different numbers of NEUTRONS are called isotopes.
  • If the number of neutrons differs in an isotope then it means that they have a different mass.
  • These are the variants of an element.
  • For example, carbon has three isotopes. C12, C13, and C14.


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