All the synthetic elements on the Periodic Table appear after Uranium (atomic no. 92). These are the only synthetic elements.
All the natural element are elements 1 through 92, or Hydrogen through Uranium. However, there are two exceptions: Promethium and Technetium, elements 43 and 61, which for some reason are strictly synthetic, or unable to be formed in nature.
Synthetic or man-made elements. Obviously synthetic sounds significantly cooler.
Compounds are formed from elements.
The forgotten natural rubber that once powered the world, from a tree called balata, which is found in British Guiana, now called ( Guyana) in the north of South America. It is one of the most incredible element, that has been replaced be synthetic rubber and is very polluting for our beautiful planet, because it is petroleum based. The Word of God, the Bible has a lot of wisdom lessons to teach, which we have neglected, and have had detrimentale effects on our world, to this day. The Book of Jeremiah 10: 23 in the Bible explains in simple words that " It does not belong to man who is walking, even to direct his step. History has shown what a poor job we have done so far. Humans are more focussed on their smartphones today, than being focussed on what God's creation could teach us in terms of wisdom. The Book of Proverbs 6: 6-8 in the Bible tells us to go to the ant, observe its ways and become wise. Ants are remarkably cooperative, they keep their environment very clean and show concern for their fellows, at time assisting injured or exhausted ants back to the nest. The Book of 2 Timothy 3: 1-5 describe the way humans behave today, in these words. " People are lovers of themselves, lovers of money, having no natural affection, lovers of pleasure rather than lovers of God, who is the Creator of our beautiful planet. Read Revelation 4: 11 So to answer your question, which is " What are the elements that cannot be found on earth and can be created. The answer is: Human technology have only been able to imitate a pale copy of some elements found on earth, with detrimental effects.
not reactive
einsteinium,......
Carbon
Radioactive
Yes, they are true chemical elements but man made.
Synthetic elements are obtained by nuclear reactions.
Creation of synthetic elements in the laboratory is not based on nuclear fusion.