The heaviest element known up till January 2015 has the atomic number

The heaviest element known up till January 2015 has the atomic number :

[amp_mcq option1=”117″ option2=”118″ option3=”119″ option4=”120″ correct=”option2″]

This question was previously asked in

UPSC CAPF – 2015

As of January 2015, the element with the highest atomic number that had been synthesized and reported was Element 118, Oganesson (Og). While its official naming and addition to the periodic table by IUPAC/IUPAP occurred later, its synthesis was first reported in 2002 and confirmed in 2006 by a Russian-American collaboration. Element 117 (Tennessine, Ts) synthesis was reported in 2010 and confirmed in 2014. Thus, both 117 and 118 were “known” (synthesized) before January 2015, with 118 having the highest atomic number.

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 elements are synthetic and highly unstable, existing for only fractions of a second. Elements with atomic numbers 113, 115, 117, and 118 were officially added to the periodic table by IUPAC in December 2015 and named in 2016. Elements 119 and 120 were theoretical or subjects of ongoing synthesis attempts by January 2015.

More similar MCQ questions for Exam preparation:-