Which of the following statements is incorrec | vedclass

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(C) The atomic radius of $Na$ is greater than that of $Mg$ because $Na$ has a lower nuclear charge than $Mg$ across the period. This statement is corr

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Melting and boiling points of $Mg$ are greater than those of $Ca$

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(C) The atomic radius of $Na$ is greater than that of $Mg$ because $Na$ has a lower nuclear charge than $Mg$ across the period. This statement is correct.Due to the higher nuclear charge and two valence electrons in $Mg$ compared to one in $Na$,the metallic bond in $Mg$ is stronger than in $Na$. This statement is correct.Magnesium has lower melting and boiling points than $Ca$. This is because $Ca$ has a larger atomic size and different crystal structure,but generally,the metallic bonding trends in alkaline earth metals are influenced by their packing and electronic configuration. Specifically,$Mg$ has a hexagonal close-packed structure,while $Ca$ has a face-centered cubic structure. The melting point of $Mg$ $(923 \ K)$ is lower than that of $Ca$ $(1124 \ K)$. Thus,the statement that $Mg$ has higher melting and boiling points than $Ca$ is incorrect.$Mg$ and $Ca$ are indeed the most abundant alkaline earth metals in the Earth's crust. This statement is correct.

Which of the following statements is incorrect?

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