when it is said that nucleus is unstable
Solution-
When we say that the Nucleus is unstable this means that element has the radioactive property as the radiation occurs from the unstable nuclei only. For example-
lead, lead-206 has 82 protons and has 124 neutrons. Nuclei with too many, or too few, neutrons do exist naturally but are unstable and will disintegrate (or decay) by emitting radiation. This is called radioactive decay.
When we say that the Nucleus is unstable this means that element has the radioactive property as the radiation occurs from the unstable nuclei only. For example-
lead, lead-206 has 82 protons and has 124 neutrons. Nuclei with too many, or too few, neutrons do exist naturally but are unstable and will disintegrate (or decay) by emitting radiation. This is called radioactive decay.