Choose the correct order for the given properties.

  • A
    $NaF < MgF_2 < AlF_3$ : covalent character order
  • B
    $NaF < MgF_2 < AlF_3$ : melting point order
  • C
    $NaF < MgF_2 < AlF_3$ : lattice energy order
  • D
    All of above are correct

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In the Lewis dot structure for $NO_2^-$,the total number of valence electrons around the nitrogen atom is $.......$

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