What example is there for the formula AX1E1 (molecular geometry)?

An example of technology is the a. addition of a side group to an organic molecule during synthesis. b. use of a new antibiotic to fight an infection. c. measurement of iron concentration in a water sample. d. study of atomic fusion reactions

Label a-f based on the table using c for concentrated and d for dilute

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17