GENERAL KNOWLEDGE

Detailed explanation-1: -The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive. Lithium, sodium, and potassium all react with water, for example.

Detailed explanation-2: -Therefore, the left side of the modern periodic table consists of metals.

Detailed explanation-3: -Due to low ionisation energy at the extreme left, elements will be able to lose electrons with ease while high electron gain enthalpy at the extreme right of periodic table, elements will be able to gain electrons with ease. Hence high chemical reactivity is observed at the extreme ends of the periodic table.