Nuclear Chemistry - Result Question 15
####18. Emission of an alpha particle leads to a [1989]
(a) Decrease of 2 units in the charge of the atom
(b) Increase of 2 units in the mass of the atom
(c) Decrease of 2 units in the mass of the atom
(d) Increase of 4 units in the mass of the atom.
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Solution:
- (a) Emission of $\alpha$-particle $( _2^{4} He)$ leads to decrease of 2 units of charge. e.g.
$ _{92} U^{238} \longrightarrow _{90} Th^{234}+ _2 He^{4} $
