← Back to the table

Every score here is current — nothing is delayed. Personal members see monthly resolution →
89 Actinide
Ac

Actinium

RIS 0.008
Velocity
Rank#86
Co-citedLu
Physical properties
Category Actinide
Block f-block
State Solid
Config [Rn] 6d1 7s2
Electronegativity 1.1
Density 10.07 g/cm³
Melting 1323.0 K
Boiling 3471.0 K
Ionization 499.0 kJ/mol
Oxidation +2, +3
Discovered 1899 · Friedrich Oskar Giesel, Andre-Louis Debierne
10-year trends

Research trends from the past decade for this element.

Research trends from the past decade: publication rate, citation momentum, emerging applications. A bird's-eye view of how the field has been evolving.

Free →

Unlocks with a free account.

Top papers of all time
Cancers · 2025 · 89th percentile for its age
Theranostics · 2025 · 98th percentile for its age
Pharmaceuticals · 2025 · 92nd percentile for its age
Top papers, last 5 years
Cancers · 2025 · 89th percentile for its age
Theranostics · 2025 · 98th percentile for its age
Pharmaceuticals · 2025 · 92nd percentile for its age
Newest papers
Cancers · 2026 · 95th percentile for its age
Communications Chemistry · 2026 · 87th percentile for its age
Theranostics · 2026 · 87th percentile for its age

These are the nine that matter most. There are more — browse all of them free.

Found one worth keeping? Personal remembers it for you, in a reading list you can come back to.

Actinium's history

Research intensity over time

Actinium's history

Actinium's research intensity, 1900 → today.

See how it got here — free account.
Advanced visualization features

Actinium's associations

These shapes are citation clusters: groups of papers that cite each other. They show why Actinium is moving, not just that it is.

Unlocks with a free account.