아인 슈타이 늄

소개

원자 번호: 99
그룹: 없음
원자 무게: 252
기간: 7
CAS 번호: 7429-92-7

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더 안정 동위 원소 없습니다
고체
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고체 (예상)

기술 • 용도 / 기능

Einsteinium, the seventh transuranic element of the actinide series to be discovered, was identified by Ghiorso and co-workers at Berkeley in December 1952 in debris from the first large thermonuclear explosion, which took place in the Pacific in November 1952. The isotope produced was the 20-day 253Es isotope. In 1961, a sufficient amount of einsteinium was produced to permit separation of a macroscopic amount of 253Es. This sample weighed about 0.01 micrograms. A special magnetic-type balance was used in making this determination. 253Es so produced was used to produce mendelevium (Element 101). About 3 micrograms of einsteinium has been produced at Oak Ridge National Laboratories by irradiating for several years kilogram quantities of 239Pu in a reactor to produce 242Pu. This was then fabricated into pellets of plutonium oxide and aluminum powder, and loaded into target rods for an initial 1-year irradiation at the Savannah River Plant, followed by irradiation in a HFIR (High Flux Isotopic Reactor). After 4 months in the HFIR the targets were removed for chemical separation of the einsteinium from californium. Seventeen isotopes and isomers of einsteinium are now recognized. 254Es has the longest half-life (276 days). Tracer studies using 253Es show that einsteinium has chemical properties typical of a heavy trivalent, actinide element. 1

물리적 특성

녹는 점:2*  860 °C = 1133.15 K = 1580 °F
비점:2
승화 포인트:2 
트리플 포인트:2 
중요 포인트:2 
밀도:   g/cm3

* - at 1 atm

전자 구성

전자 구성:  *[Rn] 7s2 5f11
블록: f
최고 점유 에너지 레벨: 7
원자가 전자를: 2

양자 번호:

n = 5
ℓ = 3
m = 0
ms = -½

본딩

이온화 전위   eV 3  kJ/mol  
이온화 전위   eV 3  kJ/mol  
이온화 전위   eV 3  kJ/mol  
1 6.42    619.4

동위 원소

핵종 질량 4 하프 라이프 4 핵 스핀 4 에너지 바인딩
240Es 240.06892(43)# 1# s 1,803.77 MeV
241Es 241.06854(24)# 10(5) s [8(+6-5) s] (3/2-) 1,811.84 MeV
242Es 242.06975(35)# 13.5(25) s 1,819.91 MeV
243Es 243.06955(25)# 21(2) s 3/2-# 1,827.99 MeV
244Es 244.07088(20)# 37(4) s 1,826.74 MeV
245Es 245.07132(22)# 1.1(1) min (3/2-) 1,834.81 MeV
246Es 246.07290(24)# 7.7(5) min 4-# 1,842.88 MeV
247Es 247.07366(3)# 4.55(26) min 7/2+# 1,850.96 MeV
248Es 248.07547(6)# 27(5) min 2-#,0+# 1,859.03 MeV
249Es 249.07641(3)# 102.2(6) min 7/2+ 1,867.10 MeV
250Es 250.07861(11)# 8.6(1) h (6+) 1,875.17 MeV
251Es 251.079992(7) 33(1) h (3/2-) 1,883.24 MeV
252Es 252.08298(5) 471.7(19) d (5-) 1,882.00 MeV
253Es 253.0848247(28) 20.47(3) d 7/2+ 1,890.07 MeV
254Es 254.088022(5) 275.7(5) d (7+) 1,898.14 MeV
255Es 255.090273(12) 39.8(12) d (7/2+) 1,896.90 MeV
256Es 256.09360(11)# 25.4(24) min (1+,0-) 1,904.97 MeV
257Es 257.09598(44)# 7.7(2) d 7/2+# 1,913.04 MeV
258Es 258.09952(32)# 3# min 1,921.11 MeV
값은 # 순수 실험 데이터에서 유래하지만, 적어도 부분적으로 체계적인 동향에서되지 않습니다 표시. 약한 할당 인수는 괄호로 묶와 함께 회전합니다. 4

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안전 정보


물질 안전 보건 자료 - ACI Alloys, Inc.

자세한 내용은

외부 링크:

소스

(1) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:10.
(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, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 10:178 - 10:180.
(4) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:193, 12:219-220.
(5) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:123-6:137.
(6) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:107-6:122.
(7) - Atomic Mass Data Center. http://amdc.in2p3.fr/web/nubase_en.html (accessed July 14, 2009).