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Question

Decrease in atomic number is observed during:

A
Alpha emission
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B
Beta emission
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C
Positron emission
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D
Electron capture
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Solution

The correct option is D Electron capture
Alpha emission: AZXA4Z2Y+42He
Positron emission: AZXAZ1Y+01e

Electron capture: AZX+01eAZ1Y

Beta emission: AZX01β+AZ+1Y

Hence, decrease in atomic number is observed in alpha emission, positron emission and electron capture, whereas increase in atomic number is seen during β emission.

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