Answer:
O silver and tin
Step-by-step explanation:
The elements in the same period on the periodic table are silver and tin. These elements are both found in the fifth period on the periodic table.
A period presents the horizontal arrangement of elements in rows. Elements in the same period have the same number of electronic shell
- Lead and sodium are in different periods. Lead is in the 6th period whereas sodium is in the third period.
- Silver and tin are both in the same group but different periods.
- Oxygen is period 2 and Helium is in period 1