The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is:

Question

Canvas Classes · Accepted Answer

Strategy:
 Identify the element with the smallest radius among the list and then deduce its oxide type.

Step 1: Rank the radii
List: .
- In Period 2:  is to the right of , so it is smallest.
- In Period 3:  is to the right of , but it is in a lower period than .
Smallest overall: Boron (B).

Step 2: Identify oxide
Boron forms . This matches the type .

More questions from Classification of Elements and Periodicity