Answer to this question is C. Regarding the volume.
Answer:
Metals consist of giant structures of atoms arranged in a regular pattern. The electrons from the outer shells of the metal atoms are delocalised , and are free to move through the whole structure. This sharing of delocalised electrons results in strong metallic bonding .
Explanation:
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D Earth's core contains mostly iron and nickel
Covalent Bonds are formed by mutual sharing of electrons
