JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
Which of the following represents the correct order of increasing first ionization enthalpy for \(Ca, Ba, S, Se\) and \(Ar\) ?
- A \(Ca < S < Ba < Se < Ar\)
- B \(S < Se < Ca < Ba < Ar\)
- C \(Ba < Ca < Se < S < Ar\)
- D \(Ca < Ba < S < Se < Ar\)
Answer & Solution
Correct Answer
(C) \(Ba < Ca < Se < S < Ar\)
Step-by-step Solution
Detailed explanation
\(B\) enthalpy increases along the period but decreases down the group. The IE of an element increases as one moves across a period in the periodic table because the electrons are held tighter by the higher effective nuclear charge. The ionization energy of the elements…
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