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యాక్టీనియం
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త్వరిత వాస్తవాలు Actinium, Pronunciation ...
దస్త్రం:Actinium.jpg | |
Actinium | |
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Pronunciation | /ækˈtɪniəm/ |
Appearance | silvery-white, glowing with an eerie blue light;[1] sometimes with a golden cast[2] |
Mass number | [227] |
Actinium in the periodic table | |
Group | మూస:Infobox element/symbol-to-group/format |
Period | period 7 |
Block | f-block |
Electron configuration | [Rn] 6d1 7s2 |
Electrons per shell | 2, 8, 18, 32, 18, 9, 2 |
Physical properties | |
Phase at STP | solid |
Melting point | 1500 K (1227 °C, 2240 °F) (estimated)[2] |
Boiling point | 3500±300 K (3200±300 °C, 5800±500 °F) (extrapolated)[2] |
Density (near r.t.) | 10 g/cm3 |
Heat of fusion | 14 kJ/mol |
Heat of vaporization | 400 kJ/mol |
Molar heat capacity | 27.2 J/(mol·K) |
Atomic properties | |
Oxidation states | +3 (a strongly basic oxide) |
Electronegativity | Pauling scale: 1.1 |
Ionization energies |
|
Covalent radius | 215 pm |
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Other properties | |
Natural occurrence | from decay |
Crystal structure | face-centered cubic (fcc) |
Thermal conductivity | 12 W/(m⋅K) |
CAS Number | 7440-34-8 |
History | |
Discovery and first isolation | Friedrich Oskar Giesel (1902) |
Isotopes of actinium
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Template:infobox actinium isotopes does not exist | |
![]() | references |
మూసివేయి
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