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Have been elements made / discovered since 2000? How many and which are they ? Why do they have substituting names in case they don't exist?
Answer 1:

In 1979, the International Union of Pure and Applied Chemistry (IUPAC), a group of scientists from around the world, made some rules to help other scientists understand each other when talking about undiscovered elements. According to these rules, each element has a temporary name that is built from its atomic number. For example, un- means 1 and tri- means 3, so element number 113 is called ununtrium.

Several elements have been made and discovered since 2000. In order of discovery, they are atomic numbers 116 (livermorium), 118 (ununoctium), 115 (ununpentium), 113 (ununtrium) and 117 (ununseptium). Because these elements are fairly new, the best place to look for information about them might be the scientific journals where they are first published: Physical Review C, Journal of the Physical Society of Japan, and Physical Review Letters.

You might have noticed that many of these elements still have temporary names. Who gets to choose a new element's permanent name? The first team of scientists that can convince IUPAC that they really made a new element. This takes a lot of work and a lot of time. When the scientists at IUPAC are satisfied with the winners' work, the new name will be officially announced.


Answer 2:

I don't know how many new elements have been created in the lab, but elements behave according to known laws of physics, so we can predict what elements there will be if we can pump them up enough. Supernovae and other very powerful events in space can create elements that we cannot make on Earth; it's just that these elements decay so fast that we never get a chance to look at them.



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