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Metallic character decreases across a period and increases down a group. In period 4, K (group 1) has the highest metallic character compared to Ca, Sc, or Ti.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev
Metallic character decreases across period 3 due to increasing nuclear charge. Order: Cl < S < P < Si.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electronic Configuration and Types of Elements - s p d f Blocks
Metallic character increases down a group and decreases across a period. Among B, Al, Ga, and Tl, Tl (group 13, period 6) has the highest metallic character.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electronic Configuration and Types of Elements - s p d f Blocks
Metallic character increases down group 13. B (period 2) is a metalloid with minimal metallic properties, unlike Al, Ga, or In, which are more metallic.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
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