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All elements with atomic numbers greater than 83 are radioisotopes meaning that these elements have unstable nuclei and are radioactive. Elements with atomic numbers of 83 and less, have isotopes (stable nucleus) and most have at least one radioisotope (unstable nucleus).

Why are elements above 83 unstable?

In elements with more than 83 protons, all of the isotopes are radioactive. In the Figure above, these are the elements with a yellow background. The force of repulsion among all those protons makes the nuclei unstable. Elements with more than 92 protons have such unstable nuclei that they don't even exist in nature.

Why are elements with more than 83 protons radioactive?

Radioactive Elements They are unstable because they have too much energy, too many protons, or an unstable ratio of protons to neutrons. For example, all elements with more than 83 protons—such as uranium, radium, and polonium—have unstable nuclei. They are called radioactive elements.

Why all the elements of atomic number higher than 82 are radioactive?

The elements present in the actinide series are radioactive elements. Actinide series starts from the element thorium having the atomic number 90. Hence, elements having the atomic number greater than 82 are radioactive.

Why all nuclei with atomic number Z greater than 83 are unstable?

All other stable nuclei have a higher neutron-to-proton ratio, which increases steadily to about 1.5 for the heaviest nuclei. Regardless of the number of neutrons, however, all elements with Z > 83 are unstable and radioactive.

Why are all elements above 82 unstable?

When the mass number of the atom is greater than 82, the atoms are not stable because of the level of binding energy. The repulsive force between the particles is more.

Why are higher elements unstable?

Why some elements are radioactive (unstable). When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced or unstable.

Can all elements become radioactive?

Typically, the most stable form of an element is the most common in nature. However, all elements have an unstable form. Unstable forms emit ionizing radiation and are radioactive. There are some elements with no stable form that are always radioactive, such as uranium.

Why are larger nuclei radioactive?

Atoms are radioactive if the protons and neutrons in the nucleus are configured in an unstable way. … For large numbers of protons in the nucleus, the repulsive electric force between protons leads to stable nuclei that favor neutrons over protons.

What is true of all elements above 82?

First, there is nothing inherently different about transuranic elements. They do share some common characteristics. As a class, they are all radioactive. But that's also true of all elements above atomic number 82 (lead) (Pb-208 being the heaviest stable isotope known).