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Atomic radius increases down a group due to additional electron shells. For group 2: Be < Mg < Ca.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy
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
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