Why are s-block elements highly reactive?
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A.
They have completely filled orbitals.
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B.
They have low atomic size.
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C.
They have low ionisation enthalpy.
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D.
They have high ionisation enthalpy. Section : Technical Abilities
Correct Answer:
C. They have low ionisation enthalpy.
Explanation:
The high reactivity of s-block elements is primarily attributed to their low ionization enthalpy. Because these elements have a large atomic size, the attraction between the nucleus and the outermost valence electrons is relatively weak. This makes it very easy for them to lose their valence electrons to form positive ions, resulting in high chemical reactivity. In contrast, having completely filled orbitals or a small atomic size are characteristics that generally lead to lower reactivity or greater stability.
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