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Oxygen is the element produced after photosynthesis.
Element 109 has been produced a lot since it's discovery and, yes, it is a transition metal.
Carbon is the element that is black and is produced when there is incomplete burning.
Element boards are manufactured in China.
My semen
Plutonium is an element that does not occur in nature in significant amounts but can be produced artificially in nuclear reactors.
The first element to be made artificially was technetium.
It is an element (Ni). It can not be made.
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No fusion, no element
The element forming at the cathode will depend on what elements are present. Reduction takes place at the cathode, so whatever element is being reduced, that is the one that will be produced at the cathode.
Since the first element ever produced synthetically was Technetium, then it will be in the Transition Metal block.