Which of the following statement is incorrect? (a) The atomic radius of \( \mathrm{Na} \) is gre...

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Which of the following statement is incorrect?
(a) The atomic radius of \( \mathrm{Na} \) is greater than that of \( \mathrm{Mg} \).
(b) Metallic bond of Mg is stronger than the metallic bond in Na.
(c) Melting and boiling points of \( \mathrm{Mg} \) are less than those of Ca.
(d) \( \mathrm{Mg} \) and \( \mathrm{Ca} \) both impart characteristic colour to the flame.
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