What may be the place of a doughter element in the periodic table, which is obtained after the nuclide `._(84)Po^(218)` undergoes, an `alpha`-emission followed by two successive `beta-`emission?

Explanation

The lose of one `alpha`-particle will reduce the mass number by 4 and atomic number by 2. subsequent two `beta^(ɵ)` emissions will increase the atomic number by 2 without affecting the mass number. Hence, the new element will be only an isotope of the parent nuclide withe mass number four less, i.e., `._(84)Po^(214)`, and hence its position in the periodic table remains unchanged.