Answer: The element E is Krypton (Kr).
Explanation:
In a nuclear reaction, the total mass and total atomic number remains the same.
The given nuclear reaction follows:
[tex]_{35}^{75}\textrm{Br}\rightarrow ^{A}_{Z}\textrm{X}+^0_{-1}\textrm{e}[/tex]
Total mass on reactant side = total mass on product side
75 = A + 0
A = 75
Total atomic number on reactant side = total atomic number on product side
35 = Z + (-1)
Z = 36
The isotopic symbol of element E is [tex]_{36}^{75}\textrm{Kr}[/tex]
Hence, the element E is Krypton (Kr).
