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원자 번호: 89
그룹: 3 or III B
원자 무게: 227
기간: 7
CAS 번호: 7440-34-8

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고체 (예상)

기술 • 용도 / 기능

Discovered by Andre Debierne in 1899 and independently by F. Giesel in 1902. Occurs naturally in association with uranium minerals. Thirty two isotopes and isomers are now recognized. All are radioactive. Actinium-227, a decay product of uranium-235, is an alpha and beta emitter with a 21.77-year halflife. Its principal decay products are thorium-227 (18.72-day half-life), radium-223 (11.4-day half-life), and a number of short-lived products including radon, bismuth, polonium, and lead isotopes. In equilibrium with its decay products, it is a powerful source of alpha rays. Actinium metal has been prepared by the reduction of actinium fluoride with lithium vapor at about 1100 to 1300°C. The chemical behavior of actinium is similar to that of the rare earths, particularly lanthanum. Purified actinium comes into equilibrium with its decay products at the end of 185 days, and then decays according to its 21.77-year half-life. It is about 150 times as active as radium, making it of value in the production of neutrons. 1

물리적 특성

녹는 점:2*  1051 °C = 1324.15 K = 1923.8 °F
비점:2* 3198 °C = 3471.15 K = 5788.4 °F
승화 포인트:2 
트리플 포인트:2 
중요 포인트:2 
밀도:3  10 g/cm3

* - at 1 atm

전자 구성

전자 구성:  *[Rn] 7s2 5f1
블록: d
최고 점유 에너지 레벨: 7
원자가 전자를: 

양자 번호:

n = 5
ℓ = 3
m = -3
ms = +½

본딩

전기 음성도 (폴링 규모):4 1.1
Electropositivity (폴링 규모): 2.9
전자 친화도:5 0.35 eV
산화 미국: +3

이온화 전위   eV 6  kJ/mol  
이온화 전위   eV 6  kJ/mol  
1 5.17    498.8
이온화 전위   eV 6  kJ/mol  
2 12.1    1167.5

열화학

비열: 0.120 J/g°C 7 = 27.240 J/mol°C = 0.029 cal/g°C = 6.511 cal/mol°C
열 전도성: 12 (W/m)/K, 27°C 8
퓨전의 열: 
기화의 열: 
물질의 상태 형성의 엔탈피 (ΔHf°)9 엔트로피 (S°)9 깁스 자유 에너지 (ΔGf°)9
(kcal/mol) (kJ/mol) (cal/K) (J/K) (kcal/mol) (kJ/mol)
(s) 0 0 15.00 62.76 0 0
(g) 94.0 393.296
(s) 0.0 0 56.5 236.396
(g) 406.0 1698.704 188.1 787.0104 366.0 1531.344

동위 원소

핵종 질량 10 하프 라이프 10 핵 스핀 10 에너지 바인딩
206Ac 206.01450(8) 25(7) ms (3+) 1,583.74 MeV
207Ac 207.01195(6) 31(8) ms [27(+11-6) ms] 9/2-# 1,591.82 MeV
208Ac 208.01155(6) 97(16) ms [95(+24-16) ms] (3+) 1,599.89 MeV
209Ac 209.00949(5) 92(11) ms (9/2-) 1,617.27 MeV
210Ac 210.00944(6) 350(40) ms 7+# 1,625.35 MeV
211Ac 211.00773(8) 213(25) ms 9/2-# 1,633.42 MeV
212Ac 212.00781(7) 920(50) ms 6+# 1,641.49 MeV
213Ac 213.00661(6) 731(17) ms (9/2-)# 1,649.56 MeV
214Ac 214.006902(24) 8.2(2) s (5+)# 1,657.63 MeV
215Ac 215.006454(23) 0.17(1) s 9/2- 1,665.70 MeV
216Ac 216.008720(29) 0.440(16) ms (1-) 1,673.77 MeV
217Ac 217.009347(14) 69(4) ns 9/2- 1,681.84 MeV
218Ac 218.01164(5) 1.08(9) μs (1-)# 1,680.60 MeV
219Ac 219.01242(5) 11.8(15) μs 9/2- 1,688.67 MeV
220Ac 220.014763(16) 26.36(19) ms (3-) 1,696.74 MeV
221Ac 221.01559(5) 52(2) ms 9/2-# 1,704.81 MeV
222Ac 222.017844(6) 5.0(5) s 1- 1,712.89 MeV
223Ac 223.019137(8) 2.10(5) min (5/2-) 1,720.96 MeV
224Ac 224.021723(4) 2.78(17) h 0- 1,719.71 MeV
225Ac 225.023230(5) 10.0(1) d (3/2-) 1,727.79 MeV
226Ac 226.026098(4) 29.37(12) h (1)(-#) 1,735.86 MeV
227Ac 227.0277521(26) 21.772(3) a 3/2- 1,743.93 MeV
228Ac 228.0310211(27) 6.15(2) h 3+ 1,742.68 MeV
229Ac 229.03302(4) 62.7(5) min (3/2+) 1,750.76 MeV
230Ac 230.03629(32) 122(3) s (1+) 1,758.83 MeV
231Ac 231.03856(11) 7.5(1) min (1/2+) 1,766.90 MeV
232Ac 232.04203(11) 119(5) s (1+) 1,765.65 MeV
233Ac 233.04455(32)# 145(10) s (1/2+) 1,773.73 MeV
234Ac 234.04842(43)# 44(7) s 1,781.80 MeV
235Ac 235.05123(38)# 40# s 1/2+# 1,780.55 MeV
236Ac 236.05530(54)# 2# min 1,788.62 MeV
값은 # 순수 실험 데이터에서 유래하지만, 적어도 부분적으로 체계적인 동향에서되지 않습니다 표시. 약한 할당 인수는 괄호로 묶와 함께 회전합니다. 10

풍부

지구 -  빵 껍질:  0.00000000055 mg/kg = 0.000000000000055% 11

안전 정보


물질 안전 보건 자료 - ACI Alloys, Inc.

자세한 내용은

외부 링크:

저널:
(1) A. Debierne, C. R. Acad. Sci. 129, 593 (1899)
(2) F.O. Geisel, Ber. 55, 3608 (1902)
(3) J.G. Stites, Jr. et al., J. Am. Chem. Soc. 77, 237 (1955)
(4) J.D. Farr et al., J. Inorg. Nucl. Chem. 18, 42 (1961)
(5) O. Hahn, Ber. 40, 1462 (1907)

소스

(1) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:3.
(2) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:132.
(3) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2002; p 4:39-4:96.
(4) - Dean, John A. Lange's Handbook of Chemistry, 11th ed.; McGraw-Hill Book Company: New York, NY, 1973; p 4:8-4:149.
(5) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2002; p 10:147-10:148.
(6) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 10:178 - 10:180.
(7) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:133.
(8) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:193, 12:219-220.
(9) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:123-6:137.
(10) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:107-6:122.
(11) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2002; p 5:5.
(12) - Atomic Mass Data Center. http://amdc.in2p3.fr/web/nubase_en.html (accessed July 14, 2009).
(13) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 14:17.