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We "know" that the neutrons are in the nucleus because they add to the weight of the atom. This is particularly visible in the case of isotopes. If you have some 12C (carbon with 6 protons and 6 neutrons in the nucleus) and some 13C (carbon with 6 protons and 7 neutrons in the nucleus), then both are definitely "carbon" (they engage in the same kind of ...


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In simple terms: There are four forces governing elementary interactions, their strength and ranges are given in the table. The strong and the electromagnetic are involved in the nucleus. The other two, weak and gravity are not involved in the formation of a nucleus. Gravity is too weak and the weak interaction is involved in decays only. The protons are ...



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