OnlineCBT
Chemistry · Classification of Elements and Periodicity in Properties
हिन्दीMendeleev predicted the existence of certain undiscovered elements and left gaps in his periodic table. For Eka-aluminium, which was later discovered as Gallium, what was the predicted atomic weight?
Correct answer · Option 3
68
Explanation
Mendeleev predicted the atomic weight of Eka-aluminium to be 68, while the actually found value for Gallium is 70.
