- The chemical symbol for potassium is k
- Sodium and potassium  belong to alkali metals , group 1 on the periodic table
- The chemical symbol for sodium is na
- Therefore, na and k are in the same group

- "A puddle is a kind of body of water " is not a useful statement here

Hence, na and k are in the same group
Sodium, Na, is in the same group as
- The chemical symbol for potassium is k 
- A puddle is a kind of body of water 
- Sodium and potassium  belong to alkali metals , group 1 on the periodic table 
- The chemical symbol for sodium is na