How does a scientist know where on the periodic table to put a newly discovered element?

To put an element on the periodic table you need to get the approval of many people and it could take a long time. they put it at the next number and currently there are 118 elements, if 119 was discovered it would be put with the elements it’s most like right after the highest number in that section of the periodic table. Non metals, Akali Metals, Transition Metals, Rare Earth Elements, Noble gases, Halogens, e.t.c. are all different sections on the periodic table.

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