| Answer | Crossword Clue |
|---|---|
| BETA | Symbol designating the second of a series. |
| actinon | chemically inert, gaseous, short-lived isotope of radon that is a member of the actinium series. Symbol: An; at. no.: 86; at. wt.: 219 |
| actinons | chemically inert, gaseous, short-lived isotope of radon that is a member of the actinium series. Symbol: An; at. no.: 86; at. wt.: 219 |
| cerium | a malleable ductile steel-grey element of the lanthanide series of metals, used in lighter flints and as a reducing agent in metallurgy. Symbol: Ce; atomic no: 58; atomic wt: 140.115; valency: 3 or 4; relative density: 6.770; melting pt: 798°C; boiling pt: 3443°C |
| second | second part or the second one of a series |
| penultimate | Last but one in a series of things; second to the last |
