Understanding Alpha Decay
Alpha decay is a type of radioactive decay where an atom emits an alpha particle. An alpha particle is essentially a helium nucleus, consisting of two protons and two neutrons. This means that:
* Atomic number decreases by 2: The loss of two protons reduces the atomic number.
* Mass number decreases by 4: The loss of two protons and two neutrons reduces the mass number.
The Equation
Here's the equation for the alpha decay of actinium-225:
```
²²⁵Ac → ²²¹Fr + ⁴He
```
Explanation:
* ²²⁵Ac: This represents the parent nucleus, actinium-225.
* ²²¹Fr: This represents the daughter nucleus, francium-221, formed after the alpha particle is emitted.
* ⁴He: This represents the alpha particle, which is essentially a helium nucleus.
Key Points
* The equation is balanced in terms of both atomic numbers and mass numbers.
* The arrow indicates the direction of the decay process.
* The alpha particle is typically written as a helium nucleus, ⁴He.
Let me know if you'd like more examples or have any other questions about nuclear reactions!
