When a radioactive substance emits an $\alpha$- particle, its position in the periodic table is lowered by

  • [AIIMS 2001]
  • A

    One place

  • B

    Two places

  • C

    Three places

  • D

    Four places

Similar Questions

Which of the following is in the increasing order for penetrating power

  • [IIT 1994]

The mass of a nucleus ${ }_Z^A X$ is less that the sum of the masses of $(A-Z)$ number of neutrons and $Z$ number of protons in the nucleus. The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus. A heavy nucleus of mass $M$ can break into two light nuclei of masses $m_1$ and $m_2$ only if $\left(m_1+m_2\right)M^{\prime}$. The masses of some neutral atoms are given in the table below:

${ }_1^1 H$  $1.007825 u$ ${ }_2^1 H$ $2.014102 u$ ${ }_3^1 H$ $3.016050 u$ ${ }_2^4 He$ $4.002603 u$
${ }_3^6 Li$ $6.015123 u$ ${ }_7^3 Li$ $7.016004 u$ ${ }_70^30 Zn$ $69.925325 u$ ${ }_{34}^{82} Se$ $81.916709 u$
${ }_{64}^{152} Gd$ $151.919803 u$ ${ }_{206}^{82} Gd$ $205.974455 u$ ${ }_{209}^{83} Bi$ $208.980388 u$ ${ }_{84}^{210} Po$ $209.982876 u$

$1.$ The correct statement is:

$(A)$ The nucleus ${ }_3^6 Li$ can emit an alpha particle

$(B)$ The nucleus ${ }_{84}^{210} P_0$ can emit a proton

$(C)$ Deuteron and alpha particle can undergo complete fusion.

$(D)$ The nuclei ${ }_{30}^{70} Zn$ and ${ }_{34}^{82} Se$ can undergo complete fusion.

$2.$ The kinetic energy (in $keV$ ) of the alpha particle, when the nucleus ${ }_{84}^{210} P _0$ at rest undergoes alpha decay, is:

$(A)$ $5319$ $(B)$ $5422$ $(C)$ $5707$ $(D)$ $5818$

Give the answer question $1$ and $2.$

  • [IIT 2013]

Alpha particles are

  • [AIPMT 1999]

For the given reaction, the particle $X$ is $_6{C^{11}}{ \to _5}{B^{11}} + {\beta ^ + } + X$

 

  • [AIPMT 2000]

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

  • [NEET 2020]