Question

When Mendeleev developed the Periodic Table, he knew nothing about electrons and electron shells. How did
he
manage to arrange the elements into groups and periods in the way we see?
​

Answer 1

Answer:

Features of Mendeleev's tables

He then arranged the elements by putting those with similar properties below each other into groups. To make his classification work Mendeleev made a few changes to his order: he left gaps for yet to be discovered elements

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Answer 2

Dmitri Ivanovich Mendeleev (sometimes transliterated as Mendeleyev or Mendeleef) (English: /ˌmɛndəlˈeɪəf/ MEN-dəl-AY-əf;[2] Russian: Дмитрий Иванович Менделеев,[note 1] tr. Dmitriy Ivanovich Mendeleyev, (About this soundlisten); 8 February 1834 – 2 February 1907 [OS 27 January 1834 – 20 January 1907]) was a Russian chemist and inventor. He is best remembered for formulating the Periodic Law and creating a farsighted version of the periodic table of elements. He used the Periodic Law not only to correct the then-accepted properties of some known elements, such as the valence and atomic weight of uranium, but also to predict the properties of eight elements that were yet to be discovered.