Q.Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?

Ionisation energy and electron gain enthalpy together explain the reactivity pattern across the periodic table. Elements on the left have low ionisation energy and readily lose electrons; elements on the right have high electron gain enthalpy magnitude and readily gain electrons -- so elements at both extreme ends of a period are highly reactive, while elements in the middle are comparatively unreactive, and noble gases (neither losing nor gaining electrons readily) are essentially inert.

Ionisation energy is also directly tied to metallic character: low-ionisation-energy elements (bottom-left of the table) are metallic; high-ionisation-energy elements (top-right) are non-metallic. …