{"id":89950,"date":"2025-06-01T10:17:49","date_gmt":"2025-06-01T10:17:49","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=89950"},"modified":"2025-06-01T10:17:49","modified_gmt":"2025-06-01T10:17:49","slug":"the-heaviest-element-known-up-till-january-2015-has-the-atomic-number","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-heaviest-element-known-up-till-january-2015-has-the-atomic-number\/","title":{"rendered":"The heaviest element known up till January 2015 has the atomic number"},"content":{"rendered":"

The heaviest element known up till January 2015 has the atomic number :<\/p>\n

[amp_mcq option1=”117″ option2=”118″ option3=”119″ option4=”120″ correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CAPF – 2015<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nAs 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.
\n<\/section>\n
\nThe 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.
\n<\/section>\n
\nThe 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.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

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 Download PDFAttempt Online As of January 2015, the element with the highest atomic number that had been synthesized and reported was Element 118, Oganesson (Og). While … <\/p>\n

Detailed SolutionThe heaviest element known up till January 2015 has the atomic number<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1085],"tags":[1443,1162,1096],"class_list":["post-89950","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1443","tag-atomic-structure","tag-chemistry","no-featured-image-padding"],"yoast_head":"\nThe heaviest element known up till January 2015 has the atomic number<\/title>\n<meta name=\"description\" content=\"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.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/the-heaviest-element-known-up-till-january-2015-has-the-atomic-number\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The heaviest element known up till January 2015 has the atomic number\" \/>\n<meta property=\"og:description\" content=\"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.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-heaviest-element-known-up-till-january-2015-has-the-atomic-number\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:17:49+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"The heaviest element known up till January 2015 has the atomic number","description":"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. 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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. 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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. 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