| NEUTRINO | In physics, a particle with zero charge and very small mass (8) |
| DELTARAY | In physics, a particle, often an electron, ejected from matter by ionizing radiation |
| NEUTRONS | Postulated by Wolfgang Pauli in 1930, an elementary particle with a very small mass close to zero (8) |
| NEUTRON | An elementary particle with 0 charge and mass about equal to a proton (7) |
| ANATOMISE | Dissect a particle with chisels in the middle (9) |
| ANATOMY | Science of a particle with variable (7) |
| EUTECTIC | In physics, a mixture in such proportions that the melting point is as low as possible (8) |
| ENTHALPY | In physics, a thermodynamic quantity equivalent to the total heat content of a system |
| VAGABOND | Rover and very small governor form a relationship (8) |
| CAREFREE | No worries finding zero charge for welfare services (8) |
| BROOKLET | Brochure about river and very small stream |
| OMISSION | Zero charge for oversight (8) |
| ORIENTAL | Zero charge when carrying one from Japan, say |
| DECIGRAM | Small mass on first of this month? Good stuff (8) |
| EMBOLISM | Unusually mobile, small mass causes obstruction of blood vessel (8) |
| FREEBASE | Cocaine at zero charge, or low |
| GERANIUM | Bloomer made when removing small mass from semiconductor |
| CLEMATIS | Climber's attachment for rope is holding little mass |
| HIGGSBOSON | In physics, an elementary particle with zero spin and mass greater than zero, discovered in 2012 (5,5) |
| NODE | Vertex in a graph; or, in physics, a point of minimum displacement in a standing wave (4) |
