The correct order of increasing metallic character of Na, Be, P, Mg and Si is:

Related Formula

Core Logic

Comparing species: Largest atomic species is Mg$Mg$ (not Al$Al$, since radius decreases across period). Smallest species is Al³⁺$Al^{3+}$ (highest effective nuclear charge among isoelectronic ions). Thus, statement (2) is incorrect.

Step 1: Conclusion

Incorrect statement is (2).

Pattern Recognition

Atomic size decreases across a period (Mg > Al$Mg > Al$). Isoelectronic cations size decreases with higher positive charge (Mg²⁺ > Al³⁺$Mg^{2+} > Al^{3+}$).

Chapter Mix

Class 11 Chemistry: Classification of Elements and Periodicity in Properties