Question

how did mendeleev assemble the element in periodic table​

Answer 1

Answer:

In February 1869, while writing the second volume of his chemistry textbook Principles of Chemistry, Mendeleev devised his own form of the periodic table. ... This work culminated in Mendeleev's table in which he organized the elements by increasing atomic mass and aligned elements with similar properties in rows.

Answer 2

In February 1869, while writing the second volume of his chemistry textbook Principles of Chemistry, Mendeleev devised his own form of the periodic table. ... This work culminated in Mendeleev's table in which he organized the elements by increasing atomic mass and aligned elements with similar properties in rows.