멘델레븀

소개

원자 번호: 101
그룹: 없음
원자 무게: 258
기간: 7
CAS 번호: 7440-11-1

분류

금속
비금속
금속 비슷한
알칼리 금속
알칼리 토 금속
전이 금속
칼 코겐
할로겐
노블 가스
란타 노이드
악티 노이드
희토류 원소
백금 그룹 금속
초 우라늄
더 안정 동위 원소 없습니다
고체
액체
가스
고체 (예상)

기술 • 용도 / 기능

Mendelevium, the ninth transuranium element of the actinide series to be discovered, was first identified by Ghiorso, Harvey, Choppin, Thompson, and Seaborg early in 1955 as a result of the bombardment of the isotope einsteinium-253 with helium ions in the Berkeley 60-inch cyclotron. The isotope produced was mendelevium-256, which has a half-life of 78 min. This first identification was notable in that mendelevium-256 was synthesized on a one-atom-at-a-time basis. Sixteen isotopes and isomers are now recognized. mendelevium-258 has a half-life of 51.5 days. This isotope has been produced by the bombardment of an isotope of einsteinium with ions of helium. It now appears possible that eventually enough mendelevium-258 can be made so that some of its physical properties can be determined. Mendelevium-256 has been used to elucidate some of the chemical properties of mendelevium in aqueous solution. Experiments seem to show that the element possesses a moderately stable dipositive (II) oxidation state in addition to the tripositive (III) oxidation state,which is characteristic of actinide elements. 1

물리적 특성

녹는 점:2*  827 °C = 1100.15 K = 1520.6 °F
비점:2
승화 포인트:2 
트리플 포인트:2 
중요 포인트:2 
밀도:   g/cm3

* - at 1 atm

전자 구성

전자 구성:  *[Rn] 7s2 5f13
블록: f
최고 점유 에너지 레벨: 7
원자가 전자를: 2

양자 번호:

n = 5
ℓ = 3
m = 2
ms = -½

본딩

이온화 전위   eV 3  kJ/mol  
이온화 전위   eV 3  kJ/mol  
이온화 전위   eV 3  kJ/mol  
1 6.58    634.9

동위 원소

핵종 질량 4 하프 라이프 4 핵 스핀 4 에너지 바인딩
245Md 245.08083(35)# 0.90(25) ms (1/2-)# 1,823.93 MeV
246Md 246.08189(35)# 1.0(4) s 1,832.00 MeV
247Md 247.08164(35)# 1.12(22) s 1/2-# 1,840.08 MeV
248Md 248.08282(26)# 7(3) s 1,848.15 MeV
249Md 249.08301(24)# 24(4) s (7/2-) 1,856.22 MeV
250Md 250.08442(32)# 52(6) s 1,864.29 MeV
251Md 251.08484(22)# 4.0(5) min 7/2-# 1,872.36 MeV
252Md 252.08656(21)# 2.3(8) min 1,880.43 MeV
253Md 253.08728(22)# 12(8) min [6(+12-3) min] 7/2-# 1,888.50 MeV
254Md 254.08966(11)# 10(3) min (0-) 1,896.58 MeV
255Md 255.091083(7) 27(2) min (7/2-) 1,895.33 MeV
256Md 256.09406(6) 77(2) min (1-) 1,903.40 MeV
257Md 257.095541(3) 5.52(5) h (7/2-) 1,911.47 MeV
258Md 258.098431(5) 51.5(3) d (8-)# 1,919.55 MeV
259Md 259.10051(22)# 1.60(6) h 7/2-# 1,918.30 MeV
260Md 260.10365(34)# 27.8(8) d 1,926.37 MeV
261Md 261.10572(70)# 40# min 7/2-# 1,934.44 MeV
262Md 262.10887(63)# 3# min 1,942.52 MeV
값은 # 순수 실험 데이터에서 유래하지만, 적어도 부분적으로 체계적인 동향에서되지 않습니다 표시. 약한 할당 인수는 괄호로 묶와 함께 회전합니다. 4

풍부

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 4:19.
(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).