Question

Which of the following is the parent element of the element ${}_{20}^{102}\Omega$ if it is formed as a result of $3\alpha$ and $2{\beta }^{-}$ decays ?

• A. ${}_{16}^{90}\Gamma$
• B. ${}_{24}^{114}\Phi$
• C. ${}_{28}^{114}\Theta$
• D. ${}_8^{12}\Delta {+}_{12}^{90}\Xi$

Answer 1

The correct option is B ${}_{24}^{114}\Phi$

${}_{24}^{114}\Phi$ is the parent element of the element ${}_{20}^{102}\Omega$ if it is formed as a result of 3 alpha and 2 beta decay
${}_{24}^{114}\Phi {\to }_{20}^{102}\Omega +3_2^{4}He+2_{-1}^0\beta$
When an alpha particle is lost, the atomic number is decreased by 2 and mass number is decreased by 4. When a beta particle is lost, the atomic number increases by 1 and the mass number remains unchanged.