Question

For atoms to combine they need to have opposite spin when they approach,but if they have opposite spin acc to Pauli exclusion 1 must be + and other should be - . so let us suppose H2 one h atom has +1/2 and other has -1/2 before the reaction but 2 h will violate the Hunds principle of maximum multiplicity by having a - spin before + . So how the things work?​

Answer 1

Explanation:

Pauli's Exclusion Principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers. In other words, (1) no more than two electrons can occupy the same orbital and (2) two electrons in the same orbital must have opposite spins