# Boson or Fermion

How do you deduce that an atom is a fermion or a boson? Do you determine it from the number of neutrons because "electrons and protons cancel out each other in a neutral atom"? What does this have to do with spin? Somebody please help.I am really confused here.

• You mean experimentally? Mar 30 '18 at 8:30
• – CAF
Mar 30 '18 at 8:50
• No,not experimentally.Just theoretically! Mar 30 '18 at 10:06

It has to do with the overall spin. Bosons have integer spin $(0, 1, 2, \dots)$ and fermions have half-integer spin $(n+\tfrac{1}{2})$.
They can be either elementary or composite. Fundamental fermions that we discovered so far are the quarks and the leptons of the Standard Model. Fundamental bosons that we discovered so far are the gauge bosons (gluons, photon, $W^{\pm}$, $Z^{0}$) and the Higgs boson.