Zinc-64 undergoes beta decay as shown: GA Zn AX+ Lie
Enter the appropriate values for A and Z and the chemical
symbol for X.

Symbol for X :

Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,  

Zinc-64 undergoes beta decay, so :

The atomic number will increase by +1, and the mass number will remain the same

So that the atomic number:

30 + 1 = 31

The element with atomic number 31 is Gallium

Reaction

answer; i believe that the correct answer is (a) potassium(k)

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.