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11.NATIONAL PERIODIC TABLE DAY- February 7 National Periodic Table Day, celebrated on
February 7th, honors the publication of the first periodic table by John
Newlands in 1863 and the significant advancements in chemistry it enabled.
This day recognizes the contributions of several key scientists, including Johann
Dobereiner who organized elements into groups in 1817, and Dmitri Mendeleev who
formulated the modern periodic table in 1869, arranging elements by atomic mass.
The day also acknowledges Henry Moseley's 1913 discovery that elements could be organized by
atomic number, a crucial development in understanding atomic structure.
National Periodic Table Day serves as a reminder of the periodic table's central role in chemistry,
providing a framework for understanding the properties and behaviors of elements.