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Questions asked by users might not always be phrased in the clearest way.
The -1 oxidation state of nitrogen is not particularly stable. Nitrogen typically forms compounds with oxidation states ranging from -3 to +5, depending on the electronegativity of the other element(s) involved.
While hybridization plays a role in determining molecular geometry, it doesn't directly explain the stability of a particular oxidation state. The stability of an oxidation state is influenced by factors like electronegativity differences, bond strengths, and the overall energy of the resulting molecule.
For example, in ammonia (NH3), nitrogen has a -3 oxidation state because it forms three covalent bonds with hydrogen atoms. This state is relatively stable due to the strong N-H bonds and the complete octet around nitrogen. However, it is not accurate to solely attribute this stability to hybridization.