How many elements are there in the periodic table?
As of my knowledge cutoff in September 2021, the periodic table contains 118 confirmed elements. These elements range from hydrogen (atomic number 1) to oganesson (atomic number 118). Each element is uniquely defined by its atomic number, which represents the number of protons in the nucleus of its atoms. The periodic table organizes these elements based on their atomic number, electron configuration, and chemical properties. However, please note that the periodic table is continuously evolving as new elements are discovered or synthesized through scientific research and experimentation. Therefore, the number of elements may change in the future as new elements are added to the periodic table.