For the second period elements, the correct increasing order of first ionization enthalpy is

  • Option 1)

    Li < Be < B < C < N < O < F < Ne

  • Option 2)

    Li < B < Be < C < O < N < F < Ne

  • Option 3)

    Li < B < Be < C < N < O < F < Ne

  • Option 4)

    Li < Be < B < C < O < N < F < Ne

Answers (1)

2 Option

Li < B <Be< C < O < N < F< Ne

Li - 1s^2,2s^1,    Be - 1s^2,2s^2

B - 1s^2,2s^2, 2p^1,    C - 1s^2,2s^2, 2p^2

N - 1s^2,2s^2, 2p^3,    O - 1s^2,2s^2, 2p^4

F - 1s^2,2s^2, 2p^5,    Ne - 1s^2,2s^2, 2p^6

Stability order of the orbitals with electrons

2p^6 > 2p^5(\textup{due\;to\;F})>2p^3>2p^4>2p^2> 2s^2>2p^1 > 2s^1

Fully Filled > Half Filled > Partially Filled


Option 1)

Li < Be < B < C < N < O < F < Ne

Option 2)

Li < B < Be < C < O < N < F < Ne

Option 3)

Li < B < Be < C < N < O < F < Ne

Option 4)

Li < Be < B < C < O < N < F < Ne

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