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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.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.Jul 6, 2019

Why are nuclei with more than 83 protons unstable?

An atom with more than 83 protons undergoes alpha decay. For example uraniumhas 92 protons and thus undergoes alpha decay. If an element undergoes any type of decay including positron emission, beta emission or alpha decay the element is unstable.

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 an atom that contains more than 82 protons tends to be unstable?

As the number of protons in the nucleus increases, the number of neutrons needed for a stable nucleus increases even more rapidly. Too many protons (or too few neutrons) in the nucleus result in an imbalance between forces, which leads to nuclear instability.

Is atomic number 83 unstable?

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 do atoms become 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.

What determines whether an atom is stable or unstable?

An atom is stable if the forces among the particles that makeup the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom's nucleus may result from an excess of either neutrons or protons.

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.

Why is a proton more stable than a neutron?

The ratio is 1.5:1, the reason for this difference is because of the repulsive force between protons: the stronger the repulsion force, the more neutrons are needed to stabilize the nuclei.

Why do larger atoms have more neutrons?

As the nuclei get larger, the neutron well gets deeper as compared to the proton well and you get more neutrons than protons.