ଆକ୍ଟିନିଅମ

ଆକ୍ଟିନିଅମ ହେଉଛି ଏକ ରାସାୟନିକ ମୌଳିକ ଯାହାର ପ୍ରତୀକ Ac ଓ ପରମାଣୁ କ୍ରମାଙ୍କ ୮୯ ।

Actinium,  ₈₉Ac

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	actinium, Ac
Appearance	silvery-white
ଉଚ୍ଚାରଣ	/ækˈtɪniəm/ ak-TIN-nee-əm
Actinium in the periodic table
La ↑ Ac ↓ (Uqu) radium ← actinium → thorium
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	89
ଶ୍ରେଣୀ, ବ୍ଳକ	group n/a, f-block
ପର୍ଯ୍ୟାୟ	period 7
ମୌଳିକ ପ୍ରକାର	actinide, sometimes considered a transition metal
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	(227)
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Rn] 6d1 7s2
per shell	2, 8, 18, 32, 18, 9, 2
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	(circa) 1323 K ​(1050 °C, ​1922 °F)
ସ୍ଫୁଟନାଙ୍କ	3471 K ​(3198 °C, ​5788 °F)
Density near r.t.	10 g/cm3
Heat of fusion	14 kJ/mol
Heat of	400 kJ/mol
Molar heat capacity	27.2 J/(mol·K)
Atomic properties
Oxidation states	3 ​neutral oxide
Electronegativity	Pauling scale: 1.1
Covalent radius	215 pm
Miscellanea
Crystal structure	​face-centered cubic (fcc)
Thermal conductivity	12 W/(m·K)
Magnetic ordering	no data
CAS Number	7440-34-8
ଇତିହାସ
ଆବିଷ୍କାର	André-Louis Debierne (1899)
First isolation	André-Louis Debierne (1899)
Most stable isotopes of actinium
iso NA half-life DM DE (MeV) DP 225Ac trace 10 d α 5.935 221Fr 226Ac syn 29.37 h β− 1.117 226Th ε 0.640 226Ra α 5.536 222Fr 227Ac trace 21.772 y β− 0.045 227Th α 5.042 223Fr

ଆକ୍ଟିନିଅମ

ଧର୍ମ

ସହାୟକ ଗ୍ରନ୍ଥ

• Meyer, Gerd and Morss, Lester R. Synthesis of lanthanide and actinide compounds, Springer, 1991, ISBN 0-7923-1018-7

ବାହାର ଲିଙ୍କ

• Actinium at The Periodic Table of Videos (University of Nottingham)
• NLM Hazardous Substances Databank – Actinium, Radioactive
• Actinium Archived 2011-08-25 at the Wayback Machine. in Haire, Richard G. (2006). Morss; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer. ISBN 1-4020-3555-1.