The behaviour of lithium is similar to that of magnesium. This sort of similarity is commonly referred to as:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. diagonal relationship.
The similarity in behavior between lithium and magnesium is commonly referred to as "diagonal relationship." This term describes a unique resemblance observed between elements that are diagonally positioned from each other in the periodic table. Despite being from different groups, lithium and magnesium share certain properties due to similarities in their atomic structures and ionization energies. This results in analogous chemical behavior, such as similar reactivity patterns and tendencies in forming compounds, hence the term "diagonal relationship."