Here's why:
* Natural Abundance: The vast majority of atoms we encounter are naturally occurring. There are only a limited number of stable isotopes of each element, found in the universe from the Big Bang and stellar processes.
* Creating New Elements: Scientists have created new elements not found in nature through nuclear reactions in particle accelerators. These elements are very unstable and decay rapidly.
* Isotopes: Scientists can create different isotopes of existing elements by adding or removing neutrons from their nuclei. These isotopes might be stable or unstable, and have different properties.
So, while we can't measure the total number of atoms made in labs, we can focus on the number of unique elements and isotopes discovered or created. As of today, there are 118 known elements, including those made in labs.
Let me know if you'd like more information about specific elements or isotopes!