WHERE ON EARTH CAN THESE UNKNOWN ELEMENTS BE FOUND?
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Answer:
Technetium. The first element that was synthesised, rather than being discovered in nature, was technetium in 1937. This discovery filled a gap in the periodic table, and the fact that no stable isotopes of technetium exist explains its natural absence on Earth (and the gap).
Although there are elements we have not yet created or found in nature, scientists already know what they will be and can predict their properties. Its location and properties can be predicted because the periodic table organizes elements according to increasing atomic number.
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