The term 'It's Free of Charge' can be represented by two crossword solutions: Neutron (7 letters) and Neutrino (8 letters). Neutrons are subatomic particles that have no electric charge and are found in the nucleus of an atom. Neutrinos are also subatomic particles, but they have a very small mass and no electric charge. They interact weakly with other particles and travel at nearly the speed of light. Both neutrons and neutrinos are important components of the Standard Model of particle physics.