What is the cause of metallic luster?

  • A
    High density
  • B
    Polishing
  • C
    Atomic kernels
  • D
    Free electrons

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$\Delta_r H$ of which reaction correctly represents the lattice enthalpy of $NaCl_{(s)}$?

Which of the following has the highest melting point?

Diamond is covalent,yet it has a high melting point. Why?

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