Question

What elements both have chemical symbols that are two letters and the first letter is s

Answer 1

The elements that have chemical symbols consisting of two letters where the first letter is 'S' are:

1. Sulfur (S)
2. Selenium (Se)
3. Scandium (Sc)
4. Samarium (Sm)
5. Strontium (Sr)

These elements all fit the criteria you specified.