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 in Mg is stronger than the metallic bond in \( \mathrm{Na} \).
(C) Melting and boiling points of \( \mathrm{K} \) are greater than those of \( \mathrm{Na} \).
(D) Mg and Ca both impart characteristic colour to the flame.
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