Which of the following statement is incorrect ?A. The atomic radius of `Na` is greater than that of `Mg`B. Metallic bond in `Mg` is stronger than the metallic bond in `Na`C. Melting and boiling points of `Mg` are greater than those of `Ca`D. `Mg` and `Ca` both impart characteristic colour to the flame

Which of the following statement is incorrect ?A. The atomic radius of

1.	Which of the following statement is incorrect ?A. The atomic radius of `Na` is greater than that of `Mg`B. Metallic bond in `Mg` is stronger than the metallic bond in `Na`C. Melting and boiling points of `Mg` are greater than those of `Ca`D. `Mg` and `Ca` both impart characteristic colour to the flame
Answer» Correct Answer - D `(a)` Along the period, the nuclear charge increases and, therefore, atomic size decreases, So `Na` has larger atomic radius than `Mg`. `(b) Mg` is smaller than `Na` and `Mg` has two valence electrons per atom while `Na` has only one valence electron per atom. So `Mg` has stronger metallic bond than that of `Na(Na` is a soft metal `).` `(c)` Because of stronger metallic bond in `Mg` than `Ca`, boiling and melting point of `Mg` are greater than `Ca`. `(d) Mg` does not impart characteristic colour to the flame because the electrons in `Mg` are too strongly bound to get excited by flame. `Ca` imparts brick red colour to the flame because of its low ionisation enthalpy.

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