La profe de química Teaching science, Periodic table of the elements, Teaching chemistry

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Lothar Meyer's table of 1868 but finally published in 1895.

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Our version of the Periodic Table of the Elements is printed on a vinyl banner because it’s more durable than a laminated poster and it won’t tend to curl. 4-Significant Digits: In most cases, the average atomic mass is rounded to four significant digits because additional digits are extraneous much in the same way a math teacher has the students round pi to 3.14.

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Mendeleev's periodic table in 1904 [33]

Macho joven profesor de química en la parte delantera de la tabla periódica Fotografía de stock - Alamy