Hydrogen may be placed at the top in group ......... as well as in group ..... .... of the periodic table.

Explanation

To answer the question, "Hydrogen may be placed at the top in group ......... as well as in group ..... .... of the periodic table," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Groups of Interest**:
- We need to determine which groups in the periodic table hydrogen can be associated with.

2. **Group 1 Analysis**:
...