Question

heaviest naturally occurring element. Identify the unknown element detected by Hahn

• A. Barium - $144$
  
• B. Barium - $141$
  
• C. Barium $140$
  
• D. Xenon -$141$
  

Answer 1

The correct option is A Barium - $144$

The fission reaction is:

${}^{236}U\to$ ${}^{92Kr}+$ ${}^{A}X$

In nuclear reaction, the net mass number of the reactant must be equal to taht of product.

$\therefore$ $236=92+A$

$⟹A=144$

Thus the element detected: Barium - 144