Increase in atomic size down the group is due to:
Correct answer: D. Both A. and B.
- A. Ionisation energy
- B. Shielding effect
- C. Inert pair effect
- D. Both A. and B.
Explanation
The correct answer is Option D:Both A. and B.Atomic size increases down the group due to (i) Increase in the number of shells, and (ii) Increase in the shielding effect, which decreases the effective nuclear charge experienced by the outer electrons. Option A (Ionisation energy) is incorrect because ionization energy is not directly related to atomic size increase down a group. Option B (Shielding effect) is incorrect because it correctly explains the increase in atomic size due to the shielding effect but does not consider the increase in the number of shells as the primary reason for atomic size increase down a group.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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