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The elements A, B, C and D have atomic numbers 9, 10, 11 and 12 respectively. The correct order of ionization energy is 

1) D > C > B > A 

2) A > B > C > D 

3) B > A > C > D 

4) B > A > D > C

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4) B > A > D > C 

Element (given) Atomic number Element name
A 9 Fluorine
B 10 Neon
C 11 Sodium
D 12 Magnesium

B (inert gas) > A (halogen) > D (fully filled s - orbital) > C (alkali mental)

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