Question

which statement best compares the melting points of magnesium and sodium? sodium has a higher melting point because it contributes one fewer electron per atom than magnesium in the electron sea. magnesium has a higher melting point because it contributes one additional electron per atom than sodium in the electron sea. magnesium has a higher melting point because it contributes two additional electrons per atom than sodium in the electron sea. sodium has a higher melting point because it contributes two fewer electrons per atom than magnesium in the electron sea.

Explanation:

In metallic bonding, the strength of the bond affects the melting - point. Magnesium (Mg) has an atomic number of 12 and contributes 2 electrons to the electron - sea model of metallic bonding, while sodium (Na) with an atomic number of 11 contributes 1 electron. Stronger metallic bonds lead to higher melting points. Since magnesium contributes more electrons to the electron sea, it has stronger metallic bonds and a higher melting point.

Answer:

Magnesium has a higher melting point because it contributes one additional electron per atom than sodium in the electron sea.