Actinium

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Export map as:

Research this topic

Explore the main themes, entities and connections around Actinium. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Applications

Radioisotope thermoelectric generators Beryllium Neutron source Neutron probe Neutron radiography

22 related topics

Chemical compounds

AcF3 AcCl3 Actinium tribromide AcOF AcOCl

29 related topics

Occurrence and synthesis

Decay chain 235U 239Pu 207Pb Thorium series

27 related topics

History

Pitchblende Marie Pierre Curie Titanium Harriet Brooks

13 related topics

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

225Ac: trace
226Ac: synth
227Ac: trace
228Ac: trace
Appearance: silvery-white, glowing with an eerie blue light; sometimes with a golden cast
Atomic number (Z): 89

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

Chemical element
Symbol Chemical symbol
Atomic number
Friedrich Oskar Giesel
André-Louis Debierne
Actinides Actinide
Lawrencium
Periodic table
Polonium
226Ra Radium
Radon
Non-primordial radioactive elements Primordial element
Radioactive
Oxygen
Lanthanides Lanthanide
Oxidation state
Uranium
Thorium
Isotope
Half-life
Beta Beta particle
Alpha particles Alpha particle
Tonne
Lanthanum
Nuclear reactor
Radiation therapy

History

Bibliography

ISBN ISBN (identifier)

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

Map overview Semantic statistics

Nodes150

Edges149

Triples134

Avg. degree1.99

Density0.013333

Components1

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

Actinium

Top relations

related to External links · 19

Actinium → Actinide, Dordrecht, Edelstein, Fuger, ISBN, Jean, Kirby, Morss, NLM Hazardous Substances Databank, Norman, Nottingham, RadioactiveActinium, Springer, The Chemistry, The Netherlands, The Periodic Table, Transactinide Elements, University, Videos

related to Chemical compounds · 18

Actinium → Ac, Ac2O3, Ac2S3, AcBr3, AcCl3, AcF3, AcOBr, AcOCl, AcOF, AcPO4, Density, Due, Here, In, No, NO3, These, They

related to history · 18

Actinium → Adloff, After, André-Louis Debierne, Articles, Debierne, Debierne's, French, Friedrich Oskar Giesel, Furthermore, Giesel, Harriet Brooks, He, In, Marie, Otto Hahn, Otto Sackur, Pierre Curie, This

related to Properties · 9

Actinium → British, Dmitri Mendeleev's, Glenn, Henry Bassett, Its, Owing, Seaborg's, Solvent, The

related to Isotopes · 8

Actinium → All, Da, It, Naturally, Owing, Purified, The, Thirty-three

related to Halides · 7

Actinium → AcOF, However, In, Similarly, The, Treating, Whereas

related to Other compounds · 7

Actinium → Ac2S3, AcPO4, It, LaH2, Mixing, NaH2PO4, The

Ionization energies · 4

Actinium → (more), 1st: 499 kJ/mol, 2nd: 1170 kJ/mol, 3rd: 1900 kJ/mol

related to Occurrence and synthesis · 4

Actinium → Another, Instead, La2O3, The

related to Precautions · 3

Actinium → For, Its, When

Important terminology Word statistics

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

227ac 225ac element decay isotope radioactive thorium isotopes half-life lanthanum chemical alpha radium first oxidation radiation neutron uranium lanthanides 228ac

Entity relationships Subject–Predicate–Object triples

Subject	Predicate	Object	Confidence	Src
Actinium	225Ac	trace	1.00	infobox
Actinium	226Ac	synth	1.00	infobox
Actinium	227Ac	trace	1.00	infobox
Actinium	228Ac	trace	1.00	infobox
Actinium	Appearance	silvery-white, glowing with an eerie blue light; sometimes with a golden cast	1.00	infobox
Actinium	Atomic number (Z)	89	1.00	infobox
Actinium	Block	f-block	1.00	infobox
Actinium	Boiling point	3500±300 K (3200±300 °C, 5800±500 °F) (extrapolated)	1.00	infobox
Actinium	CAS Number	7440-34-8	1.00	infobox
Actinium	Covalent radius	215 pm	1.00	infobox
Actinium	Crystal structure	face-centered cubic (fcc) (cF4)	1.00	infobox
Actinium	Density (near r.t.)	10 g/cm3	1.00	infobox
Actinium	Discovery	Friedrich Oskar Giesel (1902)	1.00	infobox
Actinium	Electron configuration	[Rn] 6d1 7s2	1.00	infobox
Actinium	Electronegativity	Pauling scale: 1.1	1.00	infobox
Actinium	Electrons per shell	2, 8, 18, 32, 18, 9, 2	1.00	infobox
Actinium	First isolation	Joseph G. Stites, Murrell L. Salutsky, Bob D. Stone (1955)	1.00	infobox
Actinium	Group	f-block groups (no number)	1.00	infobox
Actinium	Heat of fusion	14 kJ/mol	1.00	infobox
Actinium	Heat of vaporization	400 kJ/mol	1.00	infobox
Actinium	Ionization energies	1st: 499 kJ/mol	1.00	infobox
Actinium	Ionization energies	2nd: 1170 kJ/mol	1.00	infobox
Actinium	Ionization energies	3rd: 1900 kJ/mol	1.00	infobox
Actinium	Ionization energies	(more)	1.00	infobox
Actinium	Lattice constant	a = 531.5 pm (at 20 °C)	1.00	infobox
Actinium	Main isotopes	.mw-parser-output .isotopes-table{text-align:center;width:100%;border-collapse:collapse;margin:0;padding:0}.mw-parser-output .isotopes-table-headers>:not(:first-child){padding:0…	1.00	infobox
Actinium	Melting point	1500 K (1227 °C, 2240 °F) (estimated)	1.00	infobox
Actinium	Molar heat capacity	27.2 J/(mol·K)	1.00	infobox
Actinium	Named by	André-Louis Debierne (1899)	1.00	infobox
Actinium	Naming	from the Ancient Greek ακτίς, "beam" or "ray"	1.00	infobox

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

Connections between topic areas Semantic bridges

Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

Min side: 3