Chromium is a metal in nature. So when one chromium is
bonded to another chromium, there is a weak intermolecular forces which helds
them together which we call as “metallic bonding”.
Metallic bonding is the intermolecular force of attraction which
exist between valence electrons and the metal atoms. It is considered as the
sharing of various detached electrons between many positive ions, whereby the
electrons serve as a "glue" which gives the substance a definite
structure.
Argon is perticularly important for the metal industry, being used as an inert gas shield in arc
Aluminum is the element that has an atom in the ground state with a total of three valence electrons
The answer is physical or chemical change