Among the elements A, B, C and D having atomic numbers 9, 10, 11 and 12 respectively the correct order of ionisation energies is

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A > B > C > D

B > A > D > C

B > A > C > D

D > C > B > A

answer is B.

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Detailed Solution

The elements with atomic numbers 9, 10, 11, and 12 are Fluorine, Neon, Sodium, and Magnesium respectively.

s we go down the group, the values of ionization energy decrease gradually.
As we go across the period, the value of ionization energy increases gradually.

So, Neon > Fluorine > Magnesium > Sodium.

( Neon is an inert gas element hence has the highest ionization energy, Magnesium lies next to Sodium in the periodic table hence Magnesium has higher ionization energy ).

Hence, The correct order of ionisation energies is B > A > D > C

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