What happens to the mass number and atomic number of an element when it emits $\gamma$-radiation?

  • [NEET 2020]
  • A

    Mass number increases by four and atomic number increases by two.

  • B

    Mass number decreases by four and atomic number decreases by two.

  • C

    Mass number and atomic number remain unchanged.

  • D

    Mass number remains unchanged while atomic number decreases by one.

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In the given nuclear reaction, how many $\beta$ and $\alpha$ particles are emitted $_{92}{X^{235}} \to {\;_{82}}{Y^{207}}$

In the following nuclear rection, $D \stackrel{\alpha}{\longrightarrow} D _{1} \stackrel{\beta-}{\longrightarrow} D _{2} \stackrel{\alpha}{\longrightarrow} D _{3} \stackrel{\gamma}{\longrightarrow} D _{4}$ Mass number of $D$ is $182$ and atomic number is $74$ . Mass number and atomic number of $D _{4}$ respectively will be

  • [JEE MAIN 2022]

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Assertion: ${}_Z{X^A}$ undergoes a $2\alpha  -$ decays, $2\beta  -$ decays and $2\gamma  - $ decays and the daughter product is ${}_{Z - 2}{X^{A - 8}}$

Reason : In $\alpha  - $decays the mass number decreases by $4$ and atomic number decreases by $2$. In $2\beta  - $ decays the mass number remains unchanged, but atomic number increases by $1$ only.

  • [AIIMS 2001]

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  • [AIIMS 2006]