Tennessine was first identified by a small group of scientists in 2010. Suggest one reason why tennessine was not accepted as a new element by other scientists until 2015.

A fundamental principle of the scientific method is that new discoveries must be independently verified and validated by other scientists before they are accepted. This process, known as peer review and replication, ensures that the original results were not due to error, contamination, or misinterpretation. For the discovery of a new element, which is a major claim, other laboratories would need to be able to reproduce the experiment and confirm the findings. This process takes time, which explains the delay between the initial identification in 2010 and official acceptance in 2015.