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If the mass number of an atom of an elem...

If the mass number of an atom of an element decreases by 4 and atomic number decreases by two then it is

A

`alpha`

B

`beta`

C

`gamma`

D

X-rays

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The correct Answer is:
A
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Decreases in atomic number is observed in:

Staements I: ._zX^4 undergoes 2 alpha -decays, 2 beta -decays (negative beta ) and 2 gamma -decays. As a result, the daughter product is ._z-2X^(A-B) . Staements II: In beta -decay, the mass number decreases by 4 unit and atomic number decreases by 2 unit. In beta -decay (negative beta ), the mass number remains unchanged and atomic number increases by 1 unit. In gamma -decay, mass number and atomic number remain unchanged.

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What is the valency of the element with mass number 4 and atomic number 2?

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