$_1H^2 + _1H^2 \to _2He^3 + _0n^1$. The above nuclear reaction is called:

The age of the most ancient geological formations is estimated by:

Artificial elements have been prepared by bombardment reactions in high energy accelerators. What is the mass number of the element $X$ produced in the following nuclear reaction: $_{95}^{249}Cf + _{7}^{15}N \rightarrow _{105}X + 4_{0}^{1}n$?

$_6C^{12}$ and $_1T^3$ are formed in nature due to the nuclear reaction of a neutron with:

For the reaction $^{14}N + \alpha \longrightarrow {}^{17}O + p$, $1.16 \ MeV$ (Mass equivalent $= 0.00124 \ amu$) of energy is absorbed. Mass on the reactant side is $18.00567 \ amu$ and proton mass $= 1.00782 \ amu$. The atomic mass of ${}^{17}O$ will be (in $amu$)

$_{89}Ac^{231}$ gives $_{82}Pb^{207}$ after the emission of some $\alpha$ and $\beta$ particles. The number of such $\alpha$ and $\beta$ particles are respectively: