There is no element with such symbol.
However the symbol U stands for uranium
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"He" on the Periodic Table of elements refers to Helium. Helium is a colorless, odorless, and tasteless gas that is the second lightest and second most abundant element in the observable universe.
Lu stands for Lutetium in the periodic table of elements. It is a rare earth metal with atomic number 71.
Yes, there were elements on the first periodic table. I believe that there are still elements on the periodic table.
Pe does not stand for any element in the periodic table. Each element is represented by a unique symbol, typically consisting of one or two letters.
The periodic table is named the "periodic table of elements" or simply the "periodic table."
There are 38 transition elements in the periodic table.