Consider the following nuclear reactions:

$I$. ${ }_{7}^{14} N +{ }_{2}^{4} He \longrightarrow{ }_{8}^{17} O + X$

$II$. ${ }_{4}^{9} Be +{ }_{2}^{4} H \longrightarrow{ }_{6}^{12} He +Y$

Then,

  • [KVPY 2017]
  • A

    $X$ and $Y$ are both protons

  • B

    $X$ and $Y$ are both neutrons

  • C

    $X$ is a proton and $Y$ is a neutron

  • D

    $X$ is neutron and $Y$ is a proton

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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]

The $\beta$-particles of a radioactive metal originate from

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A nucleus of an element ${}_{84}{X^{202}}$ emits an $\alpha $-particle first, $\beta $ -particle next and then a gamma photon. The final nucleus formed has an atomic number

The particles emitted by radioactive decay are deflected by magnetic field. The particles will be

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