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From left to right in periodic table :- Metallic character decreases Non-metallic character increases ⇒ It is due to increase in ionization enthalpy and increase in electron gain enthalpy.

1. A and R are true and (R) is the correct explanation of (A)
2. A and R are true but (R) is not the correct explanation of (A)
3. A is true but R is false
4. A is false but R is true

Correct answer: A and R are true and (R) is the correct explanation of (A)

Solution

As you move from left to right across the periodic table, elements transition from metals to non-metals, which is attributed to increasing ionization enthalpy that makes it harder to lose electrons, and increasing electron gain enthalpy that makes it easier for non-metals to gain electrons. This relationship explains why metallic character decreases while non-metallic character increases.

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