Question

Question 19
What type of oxide would Eka– aluminium form?

(a) ${\text{EO}}_3$
(b)${\text{E}}_3{\text{O}}_2$
(c) ${\text{E}}_2{\text{O}}_3$
(d) $\text{EO}$

Answer 1

Option (c) is correct.
Mendeleev predicted the existence of few undiscovered elements. He named one of them as eka-aluminium because he predicted that it will occupy the place below aluminium in the periodic table. Aluminum has valency three so this element will also have valency 3. Hence, its oxides formula should be ${\text{E}}_2{\text{O}}_3$.