How many protons and electrons are in the atom of sodium whose atomic number is 11?

Option (b) is the correct answer.

Explanation:

A physical change is the one that does not lead to any change in chemical composition of a substance.

For example, when a pack of fruit punch gets dissolved into the warm water it means a physical change has occurred because no change in chemical composition of fruit punch has occurred.

Also, when Pam added ice cubes into the warm water in which fruit punch was mixed then the ice will melt into the water. And, as solid state of water that is, ice is changing into liquid state so, it is also a physical change.

Thus, we can conclude that Nate was right. The ice cubes melted and the drink mix dissolved into the water. Both are physical changes.