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Successive ionization energies data (in ...

Successive ionization energies data (in eV/atom) of an element of second period is
`{:(IE_1, IE_2, IE_3, IE_4, IE_5, IE_6),(120,133,167,719 ,797,850):}`
  Find the group number of element according to long form periodic table (1 - 18 convention) 

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The correct Answer is:
13
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