What is metallic bonding , properties and everything about it?

The particles in a metal are held together by metallic bonds.

Metallic bonds are strong and a lot of energy is needed to break them. This is why metals have high melting points and boiling points.

Metals contain electrons that are free to move in the metal structure, carrying charge from place to place and allowing metals to conduct electricity well.

Metallic bonding is the strong attraction between closely packed positive metal ions and a 'sea' of delocalised electrons.

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.