Answer:
Charge on \[\alpha \] -particle \[=2e\] \[=\text{ 2 }\times \] Charge on an electron\[=\text{ 3}.\text{2 }\times \text{ 1}{{0}^{-19}}\text{C}\]. Mass of \[\alpha \]-particle \[=4{{m}_{P}}=4\times \] Mass of proton\[=\text{ 4}.00\text{26}0\text{ amu}\]. An \[\alpha \] -particle is a doubly ionised helium atom i.e., it is a helium nucleus.
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