NaNO3>O2>FeO>FeCl2>Fe>Cu>Cu(NO3)2>Cu(OH)2>CuO>Cu

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It looks like you have listed chemical substances in order of decreasing reactivity. In general, reactivity tends to increase as you move up the list.

For example, NaNO3 (sodium nitrate) is more reactive than O2 (oxygen gas) because it is a compound that can undergo chemical reactions, whereas O2 is a stable molecule that does not readily react with other substances.

Similarly, FeO (iron(II) oxide) is more reactive than FeCl2 (iron(II) chloride) because oxides are generally more reactive than chlorides.

Similarly, Cu(NO3)2 (copper(II) nitrate) is more reactive than Cu (copper metal) because nitrate compounds are generally more reactive than pure metals.

The reactivity of a substance is influenced by its chemical structure, electron configuration, and the presence of reactive groups or ions. Reactivity can also be affected by temperature, pressure, and the presence of catalysts or inhibitors.