Question: Which statement is correct? a. The atoms in hcp crystals are not as tightly packed as in fcc b.Metals can be plastically deformed by mechanical

Which statement is correct? a. The atoms in hcp crystals are not as tightly packed as in fcc b.Metals can be plastically deformed by mechanical stress due to the presence of dislocations c.When metals are deformed elastically, the atoms move to a neighboring position i the crystal lattice d. Substitution atoms must have exactly the same size as the others atoms in the crystal lattice

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