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a random doubt.I noticed that in the periodic table the elements are radioactive only after 84(polonium) as the electrons increase and the nucleus cannot hold so many electrons so it become unstable.but technitium and promethium are two elements that are radioactive in nature and have atomic number 43 and 61 only.why is it so?
They are the lightest of all other radioactive elements.They are only the stable ones.And the atomic no. plays here major significant factor to proove this.Geerally seen for odd no. radioactive elmnts.
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