You'll find it hanging on the wall of the chemistry lab !!

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The United Nations named 2019 the International Year of the Periodic Table, and thus celebrates one of the most important scientific achievements.

You'll find it hanging on the wall of the chemistry lab in every school in the world, or against the backdrop of computers obsessed with chemistry.

For decades, generations of children who sang songs for its elements - more than 100 - had successively made to keep them easy. Of course what we are talking about here is the periodic table of the elements, and what is unique about this year is that it has reached its 150th year. With its candle lit 150, it is time to test your knowledge about the periodic table.

This event will complete its session in March of this year, the month in which the Russian chemist Dmitri Mendeleev announced his periodic schedule, and he arranged within the known chemical elements at that time.

A century and a half ago, Mendeleyev's ideas withstood the test of time, although he presented them long before knowledge of the finer things of matter and the nature of the composition of atoms.

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