According to Soddy Fajan Law 'When an \( \alpha \)-particle is emitted, the daughter element has....
0According to Soddy Fajan Law
'When an \( \alpha \)-particle is emitted, the daughter element has atomic number 2 units less than that of parent element. It is
\( \mathrm{P} \)
consequently displaced two places (groups) to the left in the periodic table. When a \( \beta \)-particle is emitted, the daughter element has an atomic number 1 unit higher than that of parent element. It is consequently displaced one place (group) to the right in the periodic table".
Radioactive disintegration of \( { }_{88} \mathrm{Ra}^{226} \) takes place in the following sequene
\[
\mathrm{Ra} \xrightarrow{-\alpha} \mathrm{A} \xrightarrow{-\alpha} \mathrm{B} \xrightarrow{-\alpha} \mathrm{C} \xrightarrow{-\beta} \mathrm{D}
\]
The atomic number and group of \( \mathrm{D} \) will be respectively
(1) 82,14
(2) 83,14
(3) 83,15
(4) 84,16
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