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via NationalDayCalendar:
Remember when you were in school and the teacher call you to fine the element Gold on the periodic table?
And you freaked out about it….Well today we are celebrating because its NATIONAL PERIODIC TABLE DAY!!
To understand the development of the periodic table, we first must understand the discovery of elements and their effect on science. Ancient man knew of few elements. By the 1st century A.D., mankind knew about the elements of gold, silver, copper, iron, lead, tin, mercury, sulfur, and carbon. Over time, we added arsenic, antimony, phosphorus, and zinc to our discoveries. By 1809, there were 47 discovered elements.
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