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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 α-emission
B positron
C electron capture
Emission of an α-particle,

29892U23490Th+42He (α-particle)


Emission of positron,

137N136C+0+1e


K-electron capture,

19479Au+e0119478Pt.


Hence, option A, C and D are correct.

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