At the very end. It would be extremely heavy, and it would be man-made.
If the xkcd periodic table was used to create a new element, it would likely be a fictional or humorous element, as the xkcd periodic table is not based on scientific accuracy.
If a new element is added under francium in the periodic table, its atomic number would be 119. Francium has an atomic number of 87, so the next element in the periodic table would be the one with an atomic number of 88, which is radium. The subsequent element would have an atomic number of 119.
The periodic table is full of elements.
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The system of the Periodic Table is not changed after the addition of a new element.
The periodic table would be disturbed only if isotopes of a new element are discovered, because a periodic table is based on order of atomic number, not atomic mass. If new isotopes of a previously known element were discovered, the atomic mass shown in the periodic table might be changed, but this is very unlikely because the atomic masses shown in a periodic table are based on the naturally occurring distribution of isotopes, and any newly discovered isotopes would probably occur only in very small fractions of the total.
Changes in the number of protons in an element's nucleus would alter its position on the periodic table. The discovery of new elements could lead to the expansion of the periodic table. Advances in technology and research may also reveal new properties of known elements, potentially causing revisions to the periodic table.
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If new elements are placed, then they would be appended in the periodic table. It won't disturb existing periodic table.
An undiscovered element would not be in the periodic table. However new elements are now created, usually by bombardment of radioactivity all new elements created this way are also radio-active. There is a theory there may be an "island of stability" at around an atomic weight of 150.
The system of the Periodic Table is not changed after the addition of a new element.
The periodic table cannot be said to be completed. New elements (admittedly radioactive and short-lived), are still being made.