Across
- 1. group 1 elements
- 4. occupy same position in periodic table
- 6. first element of third period
- 8. first element
Down
- 1. third element in group 18
- 2. they are found in s and d -block
- 3. it is the basis of periodic table
- 5. number of elements in second period
- 7. first element of group 16