A. a rare isotope of aluminumB.an element predicted to have properties similar to aluminumC.a compound that contains aluminumD. a mixture of aluminum and an unknown element Please help amp; Thanks in advance :)
B is the answer. Eka- is the Sanskrit term for first, and eka-aluminium was the description Mendeleev gave to an undiscovered element he predicted would come in the same chemical group as aluminium, and be the first after aluminium in that group. He also predicted that the properties would be very similar to aluminium, and even went so far as to predict numerical values for density, melting and boiling points, and the stoichiometry of the oxide and chloride. He was correct (or very close to correct) on his predictions.
Neither of them. Nearest is B.eka-aluminium is todays Gallium(Ga). The properties and place in per.table of Gallium was predicted by Mendeleev before discovering it. It was a wonder at that time.
