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20th century scientists found why properties of elements reoccur periodically (11h 55min, jan 1, 1900 y – 14h 57min, dec 31, 1999 y)

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History of the Periodic Table

BySonya Callendar

26 Dec 2017

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706

Date:

11h 55min, jan 1, 1900 y

14h 57min, dec 31, 1999 y

~ 100 years

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