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118 elements in the periodic table
The modern periodic table contains 118 confirmed elements. The last — oganesson (Og, #118) — was synthesized in 2002 in Dubna, Russia, and named after physicist Yuri Oganessian.
Science
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Mendeleev predicted missing elements
When creating the table in 1869, Dmitri Mendeleev left blank spaces for undiscovered elements and predicted their properties. The discovery of gallium (1875), scandium (1879) and germanium (1886) brilliantly confirmed his theory.
History
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Memorizing all 118 elements
Memorizing all 118 elements is a traditional 'initiation' for chemistry students. Mnemonic poems, songs and tables exist for memorization. The world record stands at under 2 minutes.
Culture