What is the atomic number of gold?

  • A
    $77$
  • B
    $78$
  • C
    $79$
  • D
    $80$

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When the potential energy of the second excited state of an atom is $108.8 \ eV$,the recoil momentum of the atom is ...... $kg \ m/s$.

The crystal structure of $NaCl$ is:

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