Sodium is a chemical element, not a change.
The melting of Sodium is a physical change.
chemical
chemical
The dissolution of sodium chloride is considered as a physical process.
It is only a physical change.
It is a physical change as
Sublimation is a physical change.
It is a chemical change because of sodium and hydrogen bonds forming
Physical, because each slice of pellet is still the same chemically: you have merely divided your one sodium block into two blocks of sodium. If it were chemical, some kind of notable chemical difference would have occurred (you would no longer have sodium, but something else).
It's a physical change
Chemical change (which results in physical change).
physical