$${}^{209}_{83}\text{Bi}$$ is produced from a parent element by the emission of $$2\alpha$$, $$4\beta$$ and one positron what will be the parent element________________

PLACEHOLDER ANSWER - the answer is the name of an element. Two $$\alpha$$ particles remove 8 from the mass number and 4 from the atomic number, four $$\beta^-$$ particles add 4 to the atomic number, and one positron removes 1. So the parent has mass number $$209 + 8 = 217$$ and atomic number $$83 + 4 - 4 + 1 = 84$$. The parent is polonium, $${}^{217}_{84}\text{Po}$$.