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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Among the following elements, the one having the highest ionisation energy is :-
  • A
    $(Ne) 3s^2 3p^1$
  • B
    $(Ne) 3s^2 3p^4$
  • ✓
    $(Ne) 3s^2p^3$
  • D
    $(Ar) 3d^{10} 4s^2 4p^2$
✓

Answer

Correct option: C.
$(Ne) 3s^2p^3$
c
The IE increases along a period and decreases down the group. Also, IE of 15 is more than group 16 as group 15 has half-filled p subshell giving extra stability.
Thus among given option highest IE is of option B i.e. $[N e] 3 s^{2} 3 p^{3}$.

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