Question

what element has an atomic number of 1?* 2 points periodic table of the elements oxygen (o) fluorine (f) chlorine (cl) hydrogen (h)

Explanation:

The atomic number is the number of protons in an atom's nucleus. By referring to the periodic table, we can see that Chlorine (Cl) has an atomic number of 17. Oxygen (O) has an atomic number of 8, Fluorine (F) has an atomic number of 9, and Hydrogen (H) has an atomic number of 1.

Answer:

Chlorine (Cl)