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Question

Decrease in atomic number is observed in :


A
α-emission
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B
β-emission
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C
positron
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D
electron capture
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Solution

The correct options are
A $$\alpha$$-emission
B positron
C electron capture
Emission of an $$\alpha$$-particle,

 $$^{298}_{92}U\rightarrow {^{234}_{90}Th}+{^{4}_2He}$$ ($$\alpha$$-particle)


Emission of positron,

 $$^{13}_7N\rightarrow {^{13}_6C}+{^0_{+1}e}$$


K-electron capture,

 $$^{194}_{79}Au+e^0_{-1}\rightarrow {^{194}_{78}Pt}$$.


Hence, option A, C and D are correct.

Chemistry

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