Final answer:
Sodium, calcium, and potassium belong to different groups and have different properties on the periodic table.
Step-by-step explanation:
The elements sodium (Na), calcium (Ca), and potassium (K) belong to different groups and periods on the periodic table. Sodium and potassium both belong to Group 1, also known as the alkali metals, while calcium belongs to Group 2, known as the alkaline earth metals. Alkali metals are highly reactive and have similar properties, such as being shiny, good conductors of heat and electricity, and forming compounds with oxygen in a ratio of two of their atoms to one oxygen atom. On the other hand, alkaline earth metals like calcium are less reactive and also have similar properties to each other, but different from the alkali metals.