Giới thiệu
Nhóm: 18 or VIII A
trọng lượng nguyên tử: 83.798
Giai đoạn: 4
Số CAS: 7439-90-9
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Chất rắn (Dự đoán)
Sự miêu tả • Sử dụng / Chức năng
Discovered in 1898 by Ramsay and Travers in the residue left after liquid air had nearly boiled away. Krypton is present in the air to the extent of about 1 ppm. The atmosphere of Mars has been found to contain 0.3 ppm of krypton. It is one of the “noble” gases. It is characterized by its brilliant green and orange spectral lines. Naturally occurring krypton contains six stable isotopes. Twenty four other unstable isotopes and isomers are now recognized. The spectral lines of krypton are easily produced and some are very sharp. In 1960 it was internationally agreed that the fundamental unit of length, the meter, should be defined in terms of the orange-red spectral line of 86Kr. This replaced the standard meter of Paris, which was defined in terms of a bar made of a platinum-iridium alloy. In October 1983 the meter, which originally was defined as being one ten millionth of a quadrant of the earth’s polar circumference, was again redefined by the International Bureau of Weights and Measures as being the length of path traveled by light in a vacuum during a time interval of 1/299,792,458 of a second. Solid krypton is a white crystalline substance with a face-centered cubic structure which is common to all the “rare gases”. While krypton is generally thought of as a rare gas that normally does not combine with other elements to form compounds, it now appears that the existence of some krypton compounds is established. Krypton difluoride has been prepared in gram quantities and can be made by several methods. A higher fluoride of krypton and a salt of an oxyacid of krypton also have been reported. Molecule-ions of ArKr+ and KrH+ have been identified and investigated, and evidence is provided for the formation of KrXe or KrXe+. Krypton clathrates have been prepared with hydroquinone and phenol. 85Kr has found recent application in chemical analysis. By imbedding the isotope in various solids, kryptonates are formed. The activity of these kryptonates is sensitive to chemical reactions at the surface. Estimates of the concentration of reactants are therefore made possible. Krypton is used in certain photographic flash lamps for high-speed photography. Uses thus far have been limited because of its high cost. Krypton gas presently costs about $690/100 L. 1
• "Krypton and xenon are likewise used, but to a much smaller extent, in the filling of fluorescent lamps and other special lamps." 2
• "Airport runway and approach lights" 3
Tính chất vật lý
Độ nóng chảy:4*
Điểm sôi:4* -153.22 °C = 119.93 K = -243.796 °F
điểm thăng hoa:4
ba điểm:4 -157.38 °C = 115.77 K = -251.284 °F at 73.2 kPa
Điểm cốt lõi:4 -63.74 °C = 209.41 K = -82.732 °F 4
Tỉ trọng:5 3.425 g/L
* - at 1 atm
electron Cấu hình
electron Cấu hình: [Ar] 4s2 3d10 4p6
Khối: p
Cao nhất Chiếm Năng lượng Cấp: 4
Valence electron: 8
số lượng tử:
n = 4
ℓ = 1
mℓ = 1
ms = -½
bonding
electron Affinity:6 not stable eV
Quá trình oxy hóa Hoa: 0
ion hóa tiềm năng | eV 7 | kJ/mol |
1 | 13.99961 | 1350.8 |
2 | 24.35985 | 2350.4 |
3 | 36.95 | 3565.1 |
4 | 52.5 | 5065.5 |
5 | 64.7 | 6242.6 |
6 | 78.5 | 7574.1 |
7 | 111 | 10709.9 |
8 | 125.802 | 12138.0 |
9 | 230.85 | 22273.6 |
10 | 268.2 | 25877.4 |
ion hóa tiềm năng | eV 7 | kJ/mol |
11 | 308 | 29717.5 |
12 | 350 | 33769.9 |
13 | 391 | 37725.8 |
14 | 447 | 43128.9 |
15 | 492 | 47470.8 |
16 | 541 | 52198.6 |
17 | 592 | 57119.3 |
18 | 641 | 61847.1 |
19 | 786 | 75837.5 |
20 | 833 | 80372.3 |
ion hóa tiềm năng | eV 7 | kJ/mol |
21 | 884 | 85293.0 |
22 | 937 | 90406.7 |
23 | 998 | 96292.3 |
24 | 1051 | 101406.1 |
25 | 1151 | 111054.6 |
26 | 1205.3 | 116293.7 |
27 | 2928 | 282509.0 |
28 | 3070 | 296209.9 |
29 | 3227 | 311358.1 |
30 | 3381 | 326216.8 |

nhiệt hóa học
Nhiệt dung riêng: 0.248 J/g°C 8 = 20.782 J/mol°C = 0.059 cal/g°C = 4.967 cal/mol°C
Dẫn nhiệt:
Nhiệt Fusion: 1.638 kJ/mol 10 = 19.5 J/g
Nhiệt bay hơi: 9.029 kJ/mol 11 = 107.7 J/g
Nhà nước Matter | Entanpi của Formation (ΔHf°)12 | entropy (S°)12 | Gibbs miễn phí năng lượng (ΔGf°)12 | ||||
(kcal/mol) | (kJ/mol) | (cal/K) | (J/K) | (kcal/mol) | (kJ/mol) | ||
(g) | 0 | 0 | 39.191 | 163.975144 | 0 | 0 |
Đồng vị
Nuclide | Khối lượng 13 | Half-Life 13 | spin hạt nhân 13 | Ràng buộc năng lượng |
100Kr | 99.96114(54)# | 10# ms [>300 ns] | 0+ | 815.29 MeV |
69Kr | 68.96518(43)# | 32(10) ms | 5/2-# | 561.36 MeV |
70Kr | 69.95526(41)# | 52(17) ms | 0+ | 578.74 MeV |
71Kr | 70.94963(70) | 100(3) ms | (5/2)- | 592.40 MeV |
72Kr | 71.942092(9) | 17.16(18) s | 0+ | 607.00 MeV |
73Kr | 72.939289(7) | 28.6(6) s | 3/2- | 617.86 MeV |
74Kr | 73.9330844(22) | 11.50(11) min | 0+ | 631.52 MeV |
75Kr | 74.930946(9) | 4.29(17) min | 5/2+ | 642.39 MeV |
76Kr | 75.925910(4) | 14.8(1) h | 0+ | 655.12 MeV |
77Kr | 76.9246700(21) | 74.4(6) min | 5/2+ | 664.12 MeV |
78Kr | 77.9203648(12) | ỔN ĐỊNH | 0+ | 675.92 MeV |
79Kr | 78.920082(4) | 35.04(10) h | 1/2- | 683.99 MeV |
80Kr | 79.9163790(16) | ỔN ĐỊNH | 0+ | 695.79 MeV |
81Kr | 80.9165920(21) | 2.29(11)E+5 a | 7/2+ | 703.86 MeV |
82Kr | 81.9134836(19) | ỔN ĐỊNH | 0+ | 714.72 MeV |
83Kr | 82.914136(3) | ỔN ĐỊNH | 9/2+ | 721.86 MeV |
84Kr | 83.911507(3) | ỔN ĐỊNH | 0+ | 732.73 MeV |
85Kr | 84.9125273(21) | 10.776(3) a | 9/2+ | 739.87 MeV |
86Kr | 85.91061073(11) | ỔN ĐỊNH | 0+ | 749.80 MeV |
87Kr | 86.91335486(29) | 76.3(5) min | 5/2+ | 755.08 MeV |
88Kr | 87.914447(14) | 2.84(3) h | 0+ | 762.22 MeV |
89Kr | 88.91763(6) | 3.15(4) min | 3/2(+#) | 767.50 MeV |
90Kr | 89.919517(20) | 32.32(9) s | 0+ | 773.70 MeV |
91Kr | 90.92345(6) | 8.57(4) s | 5/2(+) | 778.05 MeV |
92Kr | 91.926156(13) | 1.840(8) s | 0+ | 783.33 MeV |
93Kr | 92.93127(11) | 1.286(10) s | 1/2+ | 786.74 MeV |
94Kr | 93.93436(32)# | 210(4) ms | 0+ | 792.02 MeV |
95Kr | 94.93984(43)# | 114(3) ms | 1/2(+) | 795.43 MeV |
96Kr | 95.94307(54)# | 80(7) ms | 0+ | 799.78 MeV |
97Kr | 96.94856(54)# | 63(4) ms | 3/2+# | 803.19 MeV |
98Kr | 97.95191(64)# | 46(8) ms | 0+ | 808.47 MeV |
99Kr | 98.95760(64)# | 40(11) ms | (3/2+)# | 810.95 MeV |
Các giá trị được đánh dấu # được không hoàn toàn xuất phát từ số liệu thực nghiệm, nhưng ít nhất một phần từ các xu hướng có hệ thống. Quay với lập luận phân yếu được kèm theo trong ngoặc đơn. 13 |
phong phú
trái đất - nguồn hợp chất: uncombined 14
trái đất - Nước biển: 0.00021 mg/L 15
trái đất -
vỏ trái đất:
0.0001 mg/kg = 0.00000001% 15
trái đất -
Tổng số:
0.0236E-8 cm^3/g 16
Mercury (hành tinh) -
Tổng số:
16
sao Kim -
Tổng số:
2.30E-8 cm^3/g 16
Các hợp chất
Thông tin an toàn
Bảng dữ liệu an toàn vật liệu - ACI Alloys, Inc.
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nguồn
(1) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:17.
(2) - Jolly, William L. The Chemistry of the Non-Metals; Prentice-Hall: Englewood Cliffs, New Jersey, 1966; p 23.
(3) - Whitten, Kenneth W., Davis, Raymond E., and Peck, M. Larry. General Chemistry 6th ed.; Saunders College Publishing: Orlando, FL, 2000; p 944.
(4) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:132.
(5) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2002; p 4:39-4:96.
(6) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2002; p 10:147-10:148.
(7) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 10:178 - 10:180.
(8) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:133.
(9) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:193, 12:219-220.
(10) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:123-6:137.
(11) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:107-6:122.
(12) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(13) - Atomic Mass Data Center. http://amdc.in2p3.fr/web/nubase_en.html (accessed July 14, 2009).
(14) - Silberberg, Martin S. Chemistry: The Molecular Nature of Matter and Change, 4th ed.; McGraw-Hill Higher Education: Boston, MA, 2006, p 965.
(15) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 14:17.
(16) - Morgan, John W. and Anders, Edward, Proc. Natl. Acad. Sci. USA 77, 6973-6977 (1980)