Which missing item would complete this beta decay reaction?
plato

Option (a) is the correct answer.

Explanation:

The high energy electrons are known as beta particles. Charge on a beta particle is -1, that is, similar to the charge present in an electron.

Hence, symbol that represents a beta particle is .

For example,

This reaction is a radioactive decay rection when on decaying gives along with emission of a beta particle.

Whereas is an alpha particle,   is a gamma particle, and is a neutron.

Thus, we can conclude that the particle would complete this given beta decay reaction.

Explanation:  

General representation of an element is given as:  

where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

Beta decay : In this process, a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released carries a charge of -1 units.

The given reaction would be represented as:

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.