Here's why:
* Elements are defined by their number of protons. Changing the number of protons changes the element itself.
* Nuclear reactions involve changes within the nucleus. This is where protons and neutrons reside.
* Transmutation involves altering the nucleus. This can be done through:
* Nuclear fission: Splitting a heavy nucleus into lighter nuclei.
* Nuclear fusion: Combining two light nuclei into a heavier nucleus.
* Radioactive decay: A nucleus spontaneously emits particles, changing its composition.
Examples:
* Uranium-235 undergoing fission: A neutron strikes a uranium nucleus, causing it to split into lighter elements like barium and krypton.
* Hydrogen fusing into helium: In the sun, two hydrogen nuclei fuse to form a helium nucleus.
* Carbon-14 decaying into nitrogen-14: A carbon-14 nucleus emits a beta particle, changing a neutron into a proton, and thus becoming a nitrogen-14 nucleus.
Let me know if you'd like to explore any of these processes in more detail!
