No, not all particles in nature have integer spin. In quantum mechanics, particles are classified based on their intrinsic angular momentum, which is commonly referred to as spin. Spin is quantized, meaning it can only take certain discrete values.
Fermions are particles that have half-integer spin values (e.g., 1/2, 3/2, 5/2, etc.). Examples of fermions include electrons, protons, and neutrons. Fermions follow the Pauli exclusion principle, which states that no two identical fermions can occupy the same quantum state simultaneously.
Bosons, on the other hand, have integer spin values (e.g., 0, 1, 2, etc.). Examples of bosons include photons (spin 1), gluons (spin 1), and the Higgs boson (spin 0). Unlike fermions, bosons do not obey the Pauli exclusion principle, which allows multiple bosons to occupy the same quantum state.
It's worth noting that while the classification of particles into fermions and bosons is based on their spin, other properties such as electric charge, mass, and interaction behavior also play a role in determining particle behavior and classification.