버클륨

소개

원자 번호: 97
그룹: 없음
원자 무게: 247
기간: 7
CAS 번호: 7440-40-6

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초 우라늄
더 안정 동위 원소 없습니다
고체
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가스
고체 (예상)

기술 • 용도 / 기능

Berkelium, the eighth member of the actinide transition series, was discovered in December 1949 by Thompson, Ghiorso, and Seaborg, and was the fifth transuranium element synthesized. It was produced by cyclotron bombardment of milligram amounts of 241Am with helium ions at Berkeley, California. The first isotope produced had a mass number of 243 and decayed with a half-life of 4.5 hours. Eleven isotopes are now known and have been synthesized. The existence of 249Bk, with a half-life of 320 days, makes it feasible to isolate berkelium in weighable amounts so that its properties can be investigated with macroscopic quantities. One of the first visible amounts of a pure berkelium compound, berkelium chloride, was produced in 1962. It weighed 3 billionth of a gram. Berkelium probably has not yet been prepared in elemental form, but it is expected to be a silvery metal, easily soluble in dilute mineral acids, and readily oxidized by air or oxygen at elevated temperatures to form the oxide. X-ray diffraction methods have been used to identify the following compounds: BkO2, BkO3, Bkf3, BkCl, and BkOCl. As with other actinide elements, berkelium tends to accumulate in the skeletal system. The maximum permissible body burden of 249Bk in the human skeleton is about 0.0004 micrograms. Because of its rarity, berkelium presently has no commercial or technological use. Berkelium-249 is available from O.R.N.L. at a cost of $160/microgram plus packing charges. 1

물리적 특성

Form:2 alpha
녹는 점:2*  1050 °C = 1323.15 K = 1922 °F
비점:2
승화 포인트:2 
트리플 포인트:2 
중요 포인트:2 
Form:2 beta
녹는 점:2*  986 °C = 1259.15 K = 1806.8 °F
비점:2
승화 포인트:2 
트리플 포인트:2 
중요 포인트:2 
밀도:3  14.78 (alpha)/13.25 (beta) g/cm3

* - at 1 atm

전자 구성

전자 구성:  *[Rn] 7s2 5f9
블록: f
최고 점유 에너지 레벨: 7
원자가 전자를: 2

양자 번호:

n = 5
ℓ = 3
m = -2
ms = -½

본딩

이온화 전위   eV 4  kJ/mol  
이온화 전위   eV 4  kJ/mol  
이온화 전위   eV 4  kJ/mol  
1 6.1979    598.0

동위 원소

핵종 질량 5 하프 라이프 5 핵 스핀 5 에너지 바인딩
235Bk 235.05658(43)# 20# s 1,774.29 MeV
236Bk 236.05733(43)# 1# min 1,782.37 MeV
237Bk 237.05700(24)# 1# min 7/2+# 1,790.44 MeV
238Bk 238.05828(31)# 2.40(8) min 1,798.51 MeV
239Bk 239.05828(25)# 3# min 7/2+# 1,806.58 MeV
240Bk 240.05976(16)# 4.8(8) min 1,814.65 MeV
241Bk 241.06023(22)# 4.6(4) min (7/2+) 1,813.41 MeV
242Bk 242.06198(22)# 7.0(13) min 2-# 1,821.48 MeV
243Bk 243.063008(5) 4.5(2) h (3/2-) 1,829.55 MeV
244Bk 244.065181(16) 4.35(15) h (4-)# 1,837.62 MeV
245Bk 245.0663616(25) 4.94(3) d 3/2- 1,845.69 MeV
246Bk 246.06867(6) 1.80(2) d 2(-) 1,853.76 MeV
247Bk 247.070307(6) 1.38(25)E+3 a (3/2-) 1,852.52 MeV
248Bk 248.07309(8)# >9 a 6+# 1,860.59 MeV
249Bk 249.0749867(28) 330(4) d 7/2+ 1,868.66 MeV
250Bk 250.078317(4) 3.212(5) h 2- 1,876.73 MeV
251Bk 251.080760(12) 55.6(11) min (3/2-)# 1,875.49 MeV
252Bk 252.08431(22)# 1.8(5) min 1,883.56 MeV
253Bk 253.08688(39)# 10# min 1,891.63 MeV
254Bk 254.09060(32)# 1# min 1,890.39 MeV
값은 # 순수 실험 데이터에서 유래하지만, 적어도 부분적으로 체계적인 동향에서되지 않습니다 표시. 약한 할당 인수는 괄호로 묶와 함께 회전합니다. 5

풍부

화합물

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