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Nuclear chemistry: radioactive decay kinetics and half-life
NEET level
Single correct option
Difficulty 1 of 3
as167
Uranium-238 (
Z
=
92
) decays by emission of one
α
particle. The daughter nuclide is
A
X
90
234
X
2
90
2
234
Th
B
X
93
234
X
2
93
2
234
Np
C
X
90
236
X
2
90
2
236
Th
D
X
91
238
X
2
91
2
238
Pa
Answer: A
An
α
particle is
X
2
4
X
2
2
2
4
He
, so mass number falls by 4 (
238
−
4
=
234
) and atomic number falls by 2 (
92
−
2
=
90
). The daughter is
X
90
234
X
2
90
2
234
Th
.
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