Use the periodic table of elements to determine which of the options below show the two most similar elements according to their placement in the table and we have one through eight at the top on the left side. We have one through seven and the answers are lithium and beryllium and second answer they have is lithium and manganese and next one is NANGANESEN calcium and the last is carbon and oxygen need help with the answers

To determine which of the options shows the two most similar elements based on their placement in the periodic table, we can consider their groups (columns) and periods (rows).

1. **Lithium and Beryllium**: Lithium (Li) is in Group 1 (alkali metals) and Period 2, while Beryllium (Be) is in Group 2 (alkaline earth metals) and Period 2. They are in the same period but different groups, so they have some similarities due to being in Row 2.

2. **Lithium and Manganese**: Lithium (Li) is in Group 1 and Manganese (Mn) is in Group 7 (transition metal), located in different periods (Li in Period 2 and Mn in Period 4). They are not very similar in terms of group or chemical properties.

3. **Manganese and Calcium**: Manganese (Mn) is in Group 7 and Calcium (Ca) is in Group 2. They are in different groups and periods (Mn in Period 4, Ca in Period 4) but not very similar chemically.

4. **Carbon and Oxygen**: Carbon (C) is in Group 14 and Oxygen (O) is in Group 16. They are both in Period 2, so they share the same row, but they are in different groups.

The closest similarity in terms of grouping would be **Lithium and Beryllium**, since they share the same period.

So, the most similar elements according to their placement in the periodic table are **Lithium and Beryllium**.