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""(84)^(210) Po to ""(82)^(206) Pb + ""(...

`""_(84)^(210) Po to ""_(82)^(206) Pb + ""_(2)^(4) He` . In the reaction , the position of Po in the periodic table is ___ A group when lead belongs to IV A

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`underset(VIA) (""_(84) Po^(210)) to underset(""_(82) Pb^(206)) + ""_(2)He^(4)`
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The emission of penetraing alpha , beta particle (""_(2) ^(4) He and ""_(-1)^(0)e respectively ) along with gamma - radiation (hv) was noticed from unstable nuclei . All elements having Z gt 82 show this phenomenon . The emission was explained in terms of low binding energy (giving alpha - decay) high n/p ratio (neutron decay) , gamma from a radioactive nuclide is secondary emission. An element of group III with At. no. 90 and mass number of 238 undergoes decay of one alpha - particle . The newly formed element belongs to :