آکټېنيوم

Actinium, ₈₉Ac
	دوتنه:Actinium.jpg
عمومي خواص
Pronunciation	/ækˈtɪniəm/ ; ak-TIN-nee-əm
Appearance	silvery-white, glowing with an eerie blue light; sometimes with a golden cast
Actinium په دوراني جدول کې
radium ← actinium → thorium	‍
اټومي شمیره (Z)	89
گروپ, پیریود	group 3, period 7
بلاک	d-block
Element category	actinide, sometimes considered a transition metal
Mass number	227 (most stable isotope)
Electron configuration	[Rn] 6d1 7s2
Electrons per shell	2, 8, 18, 32, 18, 9, 2
فزیکي خواص
حالت (at STP)	جامد
دويلې کيدو ټکى	1500 K (1227 °C, 2240 °F) (estimated)
يشنا ټکی	3500±300 K (3200±300 °C, 5800±500 °F) (extrapolated)
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)
اټومي خواص
Oxidation states	3, 2 (a neutral oxide)
Electronegativity	Pauling scale: 1.1
Ionization energies	1st: 499 kJ/mol ; 2nd: 1170 kJ/mol ; 3rd: 1900 kJ/mol ; (more) ;
Covalent radius	215 pm
Miscellanea
Crystal structure	face-centered cubic (fcc) Face-centered cubic crystal structure for actinium
د تودوخې تېرېدنه	12 W/(m·K)
CAS Number	7440-34-8
History
Discovery and first isolation	Friedrich Oskar Giesel (1902)
Named by	André-Louis Debierne (1899)
Main isotopes of actinium
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آکټېنيوم (په انگرېزي: Actinium) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Ac سمبول او ۸۹ اتمي شمېرې په وسیله ښودل شوی دی.

مشخصات

↑ Wall, Greg (8 September 2003). "C&EN: It's Elemental: The Periodic Table - Actinium". C&EN: It's Elemental: The Periodic Table. Chemical and Engineering News. بياځلي په 2 June 2011.
↑ ^۲٫۰ ^۲٫۱ ^۲٫۲ Kirby, Harold W.; Morss, Lester R. (2006). "Actinium". The Chemistry of the Actinide and Transactinide Elements. p. 18. doi:10.1007/1-4020-3598-5_2. ISBN 978-1-4020-3555-5.

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