| Answer | Crossword Clue |
|---|---|
| CROSS | Mass symbol |
| RHO | Symbol of mass density |
| RHO | Mass-over-volume symbol |
| MODELT | Seminal symbol of mass production |
| tau | unstable lepton with a mass approximately 3500 times that of the electron. Symbol: T |
| taus | unstable lepton with a mass approximately 3500 times that of the electron. Symbol: T |
| deuterium | isotope of hydrogen, having twice the mass of ordinary hydrogen; heavy hydrogen. Symbol: D; at. wt.: 2.01; at. no.: 1 |
