When a sodium atom becomes an ion the size of the atom?

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

Adilute aqueous potassium nitrate solution is

What does the symbol (–hfus) indicate in a phase change?