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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
The CORRECT order of first ionisation enthalpy is:
  • A
    $\mathrm{Mg}<\mathrm{Al}<\mathrm{S}<\mathrm{P}$
  • ✓
    $\mathrm{Al}<\mathrm{Mg}<\mathrm{S}<\mathrm{P}$
  • C
    $\mathrm{Mg}<\mathrm{Al}<\mathrm{P}<\mathrm{S}$
  • D
    $\mathrm{Mg}<\mathrm{S}<\mathrm{Al}<\mathrm{P}$
✓

Answer

Correct option: B.
$\mathrm{Al}<\mathrm{Mg}<\mathrm{S}<\mathrm{P}$
b
Mg$\,$AIPS $\rightarrow$ I.E. order $\rightarrow \mathrm{Al}\,<\,\mathrm{Mg}\,<\,\mathrm{S}\,<\,\mathrm{P}$

$\quad\quad\quad\quad\quad\quad\mathrm{Mg}$ $\quad\quad\mathrm{Al}$ $\quad\quad\quad\mathrm{P}$ $\quad\quad\quad\mathrm{S}$

Valence $\left[\mathrm{N}_{\mathrm{e}}\right]: 3 \mathrm{~s}^{2}$ $\quad3 \mathrm{~s}^{2} 3 \mathrm{p}^{1}$ $\quad3 \mathrm{~s}^{2} 3 \mathrm{p}^{3} \quad3 \mathrm{~s}^{2} 3 \mathrm{p}^{4}$

$\quad\quad\quad\quad\quad\quad\uparrow$ $\quad\quad\quad\quad\quad\quad\uparrow$

$\quad\quad\quad\quad\quad$Full Filled Stable $\quad$Half Filled Stable

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