# Can you write the nuclear decay equation for the beta decay of iodine-131?

##### 1 Answer

The equation is

#### Explanation:

β decay is a process in which a nucleus emits an electron.

The nuclear symbol for a β particle is

In any nuclear equation, the sum of the subscripts (atomic numbers,

For the β decay of iodine 131, we have

#""_53^131"I" → color(white)(l)_text(Z)^"M""X" + color(white)(l)_text(-1)^0"e"#

Hence

The element

So the equation is

#""_53^131"I" → ""_54^131"Xe" + color(white)(l)_text(-1)^0"e"#

Note that in β decay, the product has the same mass number but an atomic number that has increased by 1.

Here's a video on writing β decay equations.