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na2o melting point
The melting point of an oxide is a measure of how much energy it takes to melt it. The higher the melting point, the more energy it takes to melt it. The reason that metal oxides have a high melting point is because they have a strong lattice structure.
Sodium and oxygen are oppositely charged (meaning they have the same number of protons in their nuclei) so they both bond to each other via an electrostatic force. This means that a lot of energy is needed to break the bonds between these ions in order to melt them.
Magnesium and aluminum oxides have a similar melting point to sodium oxide because they also have a strong electrostatic bond between them. However, magnesium is a bigger atom than sodium so it has a higher melting point because it takes more energy to break the bond between its atoms.
Calcium oxide has a lower melting point than sodium oxide because it is more basic than sodium. This is because it is a compound of highly electropositive metal calcium and it forms when it reacts with water/steam.
During this process it converts to calcium hydroxide and then to carbon dioxide in the air. When this happens it makes a solution called quicklime.
This is an interesting and useful way to learn about the different chemical properties of a variety of compounds. It is also a great way to see why some chemicals have different melting points!
