Question

How did mandaleev infer that a blank space needs to there in the Periodic Table​

Answer 1

$\huge\tt\red{A}\tt\pink{N}\tt\blue{S}\tt\green{W}\tt\purple{E}\tt\orange{R}$

Mendeleev avoided Newlands's mistake of trying to force elements into groups where their chemistry did not match. Instead, he left empty spaces in his table for where no known element fit the properties and atomic mass for that space. He assumed that elements discovered in the future would fit in those spots.

$\huge \fbox \red{❥HeartHackerSumi}$