The question asks for the element with the highest atomic number known up until a certain date, which refers to elements that have been synthesized and their existence tentatively accepted by the scientific community, even if not fully confirmed or officially named.
The heaviest element known up till January 2015 has the atomic number :
Asked in UPSC CAPF 2015 · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)
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