National Periodic Table Day February 7

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=l1G6Z1Nn1AY

The periodic table has a long history. The discovery of elements impacted science in many ways. Ancient man only knew of a few elements. However, 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. It was time to organize, and Johann Döbereiner made one of the earliest attempts to do that. He organized the elements in 1817 into groups of three, or triads, based on similar qualities. • Come learn more: • https://nationaldaycalendar.com/natio...

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