Question

when is nucleus said to be unstable?


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Answer 1

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$Nucleus\: is\: said \: to\: \\ be\: unstable\: when\: all\: \\ the\: elements\: such\: as\: \\ urnaium,\: thorium\: radium,\: \\ have\: radioactivate\: property\: as\: \\ radiation\: occurs\: \\from\: the\: unstable\: \\ nuclei\: only\: due\: to\: high\:\\ penerating\: and\: high\: energy \: \\ radiation\:.$

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$The\: unstable\: nucleus\: of\: \\ radioactive\: atoms\: they\: emits the \\ radiation\: .And\: when\: they\: occur\: in\: \\ new\: atom\: then\: the\: new\: element\: \\ is\: formed\: which\: \\ process\: is\: knwon\: as\: radioactive\: \\ decay\: .$

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Answer 2

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Question :-

When is nucleus said to be unstable?

Answer :-

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.

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