If by vital you mean most reactive, then the metal francium, Fr, is the most reactive element.
No. If you burn an element, you will turn it into a compound (most commonly [element burnt] oxide). Which will not be an element.
You get a mixture of an element and a compound.
milk is a mixtureIt's a mixture that contains compounds and elements.For instance iron is an element in most milk, and fats are a compound.
You get a mixture of an element and a compound.
Radium is a chemical element, not a compound.
The most vital element in crime detection and criminal investigation is the human element.
It is vital for life and male ejaculate has traces of the element.
An element.
The more or most electronegative element in the compound usually appears last.
It is compound not an element.
No. If you burn an element, you will turn it into a compound (most commonly [element burnt] oxide). Which will not be an element.
Compound
Oxygen, hydrogen, halogens
The more or most electropositve element.
Lime is a compound.
element. But most elements can also be compounds. For example, oxygen is the name of an element, but two oxygens bonded together are also called oxygen, and are a compound.
You get a mixture of an element and a compound.