An element Z S A decays to 85 R 222 after emitting 2 α particles and 1 β particle. Find the atomic number and atomic mass of the element S.

$_{85}\text{R}^{222}$ before the emission of β particle, would have atomic number 84, and before 2 α emissions, atomic number would have been 88. Hence, atomic number of X = 88.

$_{85}\text{R}^{222}$ before the emission of β particle, would have mass number 222, and before 2 α emissions, mass number would have been 230. Hence, mass number of X = 230.