Question

Why were there blank spaces left in Mendeleev's table * 1 point A)He didn't know what to put there B)Undiscovered elements not yet known C)Multiple elements could have fit D)He forgot to add the elements in​

Answer 1

Answer:

Option B

Explanation:

He left gaps in his periodic table assuming in future elements will be discovered which will fit in the exact gaps left by him. Later the elements with the same properties were discovered and placed in the gaps