Question

Why did Mendeleev left some gaps in his periodic table ? Name any two elements discovered with the help of gaps in Mendeleev s periodic table ​

Answer 1

bcoz at that time technoly was not used

and eka boron

eka silicon

Answer 2

He left gaps because the elements were yet to discover . He also predicted the properties of some element and gave them the name as eka boron , eka aluminium and eka silicon later on these elements were discoverded and named as gallium ,germanium and scandium .