What happened in the 2010s?
🧪 Periodic Table Completes Seventh Row (2016): A milestone in chemistry with the addition of four new elements.
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Further Reading
Periodic table's seventh row finally filled as four new elements are ... (theguardian.com)
Seventh-Row-Periodic-Table-Complete - C&EN (acs.org)
Four New Elements Added to the Periodic Table! - Mathnasium (mathnasium.com)
Four New Elements Complete Seventh Row of Periodic Table (fishersci.com)
4 New Elements Are Added To The Periodic Table : The Two-Way (npr.org)
3Qs: Four new elements added to periodic table (northeastern.edu)
Periodic Table's 7th Row Completed With Discovery Of Four New ... (iflscience.com)