Nuclear Chemistry - Result Question 11
####11. Decrease in atomic number is observed during
(1998, 2M)
(a) alpha emission
(b) beta emission
(c) positron emission
(d) electron capture
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Answer:
Correct Answer: 11. isobars
Solution:
- In the following nuclear reactions, there occur decrease in atomic number $(Z)$
$$ \begin{aligned} { } _Z X^{A} & \longrightarrow{ } _2 He^{4}+{ } _{Z-2} Y^{A-4}, \alpha-\text { emission } \ { } _Z X^{A} & \longrightarrow{ } _{+1} e^{0}+{ } _{Z-1} Y^{A}, \text { positron emission } \ { } _Z X^{A}+{ } _{-1} e^{0} & \longrightarrow{ } _{Z-1} Y^{A} \text {, electron capture } \end{aligned} $$
In beta emission, increase in atomic number is observed.
$$ { } _Z X^{A} \longrightarrow{ } _{-1} e^{0}+{ } _{Z+1} Y^{A}, \beta \text {-emission } $$
