What are the maximum and minimum oxidation numbers of N, S and Cl?

The maximum and minimum oxidation numbers of elements can be determined based on their positions in the periodic table and the general rules for assigning oxidation numbers.

Nitrogen (N):

The maximum oxidation number for nitrogen is +5, which occurs in compounds like nitric acid (HNO3).
The minimum oxidation number for nitrogen is -3, which occurs in compounds like ammonia (NH3).
Sulfur (S):

The maximum oxidation number for sulfur is +6, which occurs in compounds like sulfur hexafluoride (SF6).
The minimum oxidation number for sulfur is -2, which occurs in compounds like hydrogen sulfide (H2S) or sulfide ions (S2-).
Chlorine (Cl):

The maximum oxidation number for chlorine is +7, which occurs in compounds like perchloric acid (HClO4).
The minimum oxidation number for chlorine is -1, which occurs in compounds like chloride ions (Cl-) or in compounds where chlorine is more electronegative than the other element it is bonded to.
These oxidation numbers are based on the electronegativity of the elements and the typical valence electrons they can gain or lose in chemical reactions. Keep in mind that there can be exceptions and variations depending on the specific compounds and conditions.