Which is considered the greatest triumph of Mendeleev's periodic table?

The correct answer to this question is Dmitri Mendelev, a Russian inventor and chemist, created the Periodic Table of Elements, which is one of the most reliable tables in science. In 1856, Mendeleev was not aware of the 56 known elements.

He had a dream about all of the elements residing in their respective place in a table, and when he woke up, he formulated the table with the exisiting elements, along with elements that he suspected would be discovered later.

He added blank boxes so that the elements that were discovered later could be added. For instance, germanium was discovered in 1886 years after the table was created, and Mendeleev had predicted it and named it eka-silicon.

The correct answer is letter A Russian inventor and a chemist, Dmitri Mendeleev formulated one of the most-used and reliable table in Science which is the Periodic Table of Elements. In the year 1856, there were only 56 known elements and Mendeleev was not aware of their existence.

It was in a dream where he envisioned all elements fall in their respective place and as soon as he woke up he wrote all that he had seen. He predicted there are existing elements not yet to be discovered in the same group. An example of this was germanium that was only discovered in 1886, years after he predicted and named it as eka-silicon.