Question

The correct order of reactivity in alkali metals.
A. Li > Na> K
B. Na > Li > K
C. K > Li > Na
D. K > Na > Li

Answer 1

Answer:

D

Explanation:

potassium sondium lithium

Answer 2

D. K > Na > Li

Explanation:

Lithium, Sodium and Potassium are alkali metals and are highly reactive. However, when we compare reactivity of these three elements with water, we note the following:

1. Potassium (K) reacts more vigorously and explosively with water. Hydrogen is released.
2. Sodium (Na) reacts less violently with water compared to Potassium.
3. Lithium (Li) sizzles in water and among the three elements exhibits the least reactivity with water.

As we move from top to bottom of a group in the periodic table, the reactivity increases.