Metallic character of an element is defined as the easiness of its atom in losing electrons. According to the modern periodic table, the metallic character of an element decreases while moving from left to right across a period.
Among the elements Ga, Ge, As, Se Be in the question. Be and Ga are expected to be most metallic.
- Out of Be and Ga, Ga is bigger in size and hence has a greater tendency to lose electrons than Be.
- Therefore, Ga is more metallic than Be.