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An isotope is unstable because isotopes are only atoms with a change in the number of neutrons. For an atom to become stable, it should have the maximum number of electrons it can have in its outer most shell, but since isotopes only deal with neutrons, this problem is not dealt with in this case. When there is a change in the number of electrons, it is called a ion. It can become stable through ionic bonding, covalent bonding and metallic bonding, depending on the two elements that are meant to bond.

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12y ago

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