Question

Why are alkali metals kept in kerosene oil?

Answer 1

Alkali metals like sodium, potassium, and lithium are all prone to losing electrons. Sodium, potassium, and lithium are all easily reactive with gases in the air or moisture. The oil inhibits alkali metals from reacting with oxygen and moisture.

Complete answer:
Alkali metals are the members of the first group. Metals have a tendency for losing electrons. The reactivity of metals reduces as you move left to right in the periodic table. As the electronegativity grows from left to right in the periodic table, it becomes more difficult to remove electrons from metals, lowering reactivity.
The alkali metals are found at the top left of the periodic table, where their electronegativity is the lowest and their reactivity is the highest.
As a result of their strong reactivity to oxygen and moisture, alkali metals are kept in kerosene oil.

Additional Information:
The alkali metals are a group of chemical elements in the periodic table's $s -$block that have similar properties: they are silvery and can be cut with a plastic knife.
At standard temperature and pressure, alkali metals are very reactive and easily lose their outermost electron, forming cations with charge $+ 1$.
All of the alkali metals discovered so far have been found in nature.
Rubidium and caesium atomic clocks, sodium-vapor lamps, and table salt are just a few of the various uses for alkali metals.

Note:
The most reactive metals in the periodic table are alkali metals. Alkali metals reactivity increases as they move down the group. As the metal's electronegativity decreases as it moves down the group, it loses electrons more readily, increasing its reactivity. Caesium is the most reactive of the alkali metals.