JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
The first ionization energy (in \(\mathrm{kJ} / \mathrm{mol}\) ) of \(Na, \;\mathrm{Mg}, \mathrm{Al}\) and \(Si\) respectively, are
- A \(496,737,577,786\)
- B \(786,737,577,496\)
- C \(496,577,737,786\)
- D \(496,577,786,737\)
Answer & Solution
Correct Answer
(A) \(496,737,577,786\)
Step-by-step Solution
Detailed explanation
Elecronic configuration of \(\mathrm{Na}=[\mathrm{Ne}] 3 \mathrm{s}^{1}\) \({\mathrm{Mg}=[\mathrm{Ne}] 3 \mathrm{s}^{2}}\) \({\mathrm{Al}=[\mathrm{Ne}] 3 \mathrm{s}^{2} 3 \mathrm{p}^{1}}\) So order of first ionisation energy is…
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