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2019 (MMXIX) was a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium and the 21st century, and the 10th and last year of the 2010s decade. 2019 was designated as International Year of the Periodic Table of Chemical Elements by the United Nations General Assembly given that it coincided with the 150th anniversary of its creation by Dmitri Mendeleev in 1869.