Some of them are highly reactive with oxygen or moisture; storing them in oil isolates them from oxygen or moisture in the air.
So that they are not exposed to the air (oxygen).
so that it cannot react with water, as when sodium and water react it is violent, so the oil keeps the water away
Yes, its kept in mineral oil to prevent oxidation.
sodium must be kept under kerosene
Yes, Some elements that have been made by scientists under laboratory.
no
Sodium is kept immersed in Kerosene oil because it's extremely reactive and will react with steam or any other substance. So as to obtain it in its pure form, it's kept in oil. Sodium is very reactive metal and it reacts with any thing that comes into contact with it.It is kept under the oil because it might react with air .
sodium lithium Alkali metals are often stored under oil.
the metals like Sodium and potassium are extremely reactive. so they are often placed under kerosene oil.
Any of the alkali metals: lithium, sodium, potassium, etc.
Oil is a chemical compound so it has multiple atoms. You need to know the elements in oil to answer your question.
so that it cannot react with water, as when sodium and water react it is violent, so the oil keeps the water away
Potassium, and Ceasium. Maybe Lithium as well. Alkali earth metals anyway.
Yes, its kept in mineral oil to prevent oxidation.
sodium must be kept under kerosene
They are alkaline if kept in oil.
Why should bilges be kept clean and free of oil drips
Only elements are in the periodic table (about 100) but oil is not an element, it is a substance.