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Be (group 2, period 2) shows a diagonal relationship with Al (group 13, period 3) due to similar size and electronegativity, unlike Mg, Ca, or B.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
B (group 13, period 2) and Si (group 14, period 3) show a diagonal relationship due to similar size and properties, unlike the other pairs.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
C (group 14, period 2) has a diagonal relationship with Si (group 14, period 3) due to similar properties, unlike B, N, or P.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
Diagonal relationships occur between second and third period elements (e.g., Li and Mg) due to similar size and electronegativity, unlike Na, K, or Be.
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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