Simple Answer: Some isotopes are more common than others due to their stability and ability to be formed in natural processes.
Some isotopes are more common than others because they have a higher natural abundance. This means that there are more atoms of those specific isotopes found in nature compared to others. The higher abundance could be due to factors such as the stability and ease of formation of the isotope, as well as the processes involved in their production.
Some isotopes are more common than others due to various factors, such as their stability and the processes that create and destroy isotopes.
