²⁴³Am → ²³⁹Np + ⁴He
Here's what each part of the equation represents:
* ²⁴³Am: Americium-243, the parent nucleus.
* ²³⁹Np: Neptunium-239, the daughter nucleus.
* ⁴He: An alpha particle, which is essentially a helium nucleus consisting of two protons and two neutrons.
Explanation:
Alpha decay is a type of radioactive decay where an unstable nucleus emits an alpha particle. This process results in the following:
* Atomic Number: The atomic number (number of protons) decreases by 2 (from 95 for americium to 93 for neptunium).
* Mass Number: The mass number (number of protons and neutrons) decreases by 4 (from 243 to 239).
Key points:
* The alpha particle is emitted with a high kinetic energy, which is responsible for the radioactive nature of the decay.
* The daughter nucleus (neptunium-239) is also radioactive and will undergo further decay.
* This decay process is an example of a nuclear reaction, where the nucleus of an atom is transformed into a different nucleus.
