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Byju's Answer
Standard X
Physics
Alpha Decay
A radioactive...
Question
A radioactive nucleus undergoes a series of decay according to the scheme:
A
a
⟶
A
1
β
⟶
A
2
α
⟶
A
3
γ
⟶
A
4
If the mass number and atomic number of `A' are 180 and 72 respectively, then the mass number and atomic number for
A
4
:
A
172 and 69
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B
174 and 70
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C
176 and 69
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D
176 and 70
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Solution
The correct option is
B
172 and 69
As we know, mass and charge of
α
=
4
and
+
2
β
=
0
and
−
1
γ
=
0
and
0
So
A
α
⟶
A
1
β
⟶
A
2
α
⟶
A
3
γ
⟶
A
4
m 180 176 176 172 172
e 72 70 71 69 69
So mass and charge of
A
4
is 172 & 69.
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