Final answer:
Approximately 90 naturally occurring elements exist on Earth, with 81 having stable isotopes. Scientists have discovered a total of 118 elements, some of which are man-made.
Explanation:
Approximately 90 naturally occurring elements are known on Earth, with 81 of them having at least one stable isotope. These elements make up the composition of Earth and have also been detected in stars. Scientists have discovered a total of 118 elements, with some being man-made and not naturally occurring.
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