Actinoid
Definition
The official systematic name recommended by IUPAC for any chemical element within the actinide series, encompassing the 15 metallic and radioactive elements with atomic numbers from 89 (actinium) to 103 (lawrencium). As an adjective, it describes a chemical behavior or atomic structure resembling that of actinium, characterized by the progressive filling of the 5f electron subshell, very high density, and electrochemical properties specific to heavy metals.
Bilingual Equivalents
- Actinoid
- Actinide
Grammatical & Source Details
| Inflection Type | Neuter noun or variable adjective, articulated: actinoidul, plural: actinoide, genitive-dative: actinoidelor. |
| Formation | Scientific compound composed of the element name 'actinium' combined with the Greek suffix '-oid' (resembling / like). |
| Spelling / Pronunciation | [ak.ti.no.ˈid] |
| Source | IUPAC Nomenclature of Inorganic Chemistry and IUPAC Gold Book |
Contextual Usage Examples
RO: Termenul actinoid este preferat în comunitatea științifică internațională pentru a evita confuzia cu sufixul -id din săruri.
EN: The term actinoid is preferred in the international scientific community to avoid confusion with the -ide suffix in salts.
RO: Fiecare actinoid din perioada a 7-a prezintă o stare de oxidare principală de plus trei, similară cu a lantanidelor.
EN: Each actinoid in the 7th period exhibits a primary oxidation state of plus three, similar to the lanthanoids.
RO: Uraniul rămâne cel mai studiat actinid datorită abundenței și importanței sale structurale în fisiune.
EN: Uranium remains the most studied actinoid due to its abundance and its structural importance in fission.
Idioms & Phrases
Seria actinoidelor / Actinoid series
RO: Grupul structural format din cele cincisprezece elemente grele care ocupă rândul de jos al tabelului periodic.
EN: The structural group consisting of the fifteen heavy elements that occupy the bottom row of the periodic table.
Element actinoid transuranian / Transuranic actinoid element
RO: Orice actinoid sintetic cu un număr atomic mai mare de 92, creat artificial prin tehnici de bombardament nuclear.
EN: Any synthetic actinoid with an atomic number greater than 92, artificially created via nuclear bombardment techniques.
Contracție actinoidă / Actinoid contraction
RO: Scădere structurală progresivă a razelor atomice pe măsură ce numărul atomic crește în cadrul acestei serii.
EN: A progressive structural decrease in atomic radii as the atomic number increases across this series.
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