GK
NUCLEAR SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The number of particles in stable nuclei never changes; the number of particles in unstable nuclei does change
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Stable nuclei contain equal numbers of protons and neutrons; unstable nuclei do not
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Stable nuclei emit electrons; unstable nuclei emit protons and neutrons
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Stable nuclei can be found everywhere; unstable nuclei do not occur in nature
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Detailed explanation-1: -Stable nuclei emit electrons; unstable nuclei emit protons and neutrons. Stable nuclei contain equal numbers of protons and neutrons; unstable nuclei do not.
Detailed explanation-2: -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.
Detailed explanation-3: -The stable isotopes have nuclei that do not decay to other isotopes on geologic time scales but may themselves be produced by the decay of radioactive isotopes. Radioactive (unstable) isotopes have nuclei that spontaneously decay over time to form other isotopes.
Detailed explanation-4: -Answer and Explanation: An atom is unstable if there are too many protons over neutrons or too many neutrons over protons. An atom is considered stable when it has a neutron/proton ratio that is equal to or close to 1.
Detailed explanation-5: -Atoms seek to be stable; so, to get to a more stable state, the atom expels energy from the nucleus in the form of a particle or ray. This process is known as radioactivity, the unstable atom is said to be a radioactive atom, and the energy that’s released is radiation.