Kripton
36
Kr
Grupă
18
Perioadă
4
Bloc
p
Protoni
Electroni
Neutroni
36
36
48
Proprietăți Generale
Număr atomic
36
Masă atomică
83,798
Numar de masa
84
Categorie
Gaze nobile
Culoare
Incolor
Radioactive
Nu
Din cuvântul grecesc kryptos, ascuns
Structură cristalină
Față Centrată Cubic
Istoric
Scottish chemist Sir William Ramsay and his assistant English chemist Morris Travers discovered krypton in 1898 in London.
They found krypton in the residue left from evaporating nearly all components of liquid air.
William Ramsay was awarded the 1904 Nobel Prize in Chemistry for discovery of a series of noble gases, including krypton.
They found krypton in the residue left from evaporating nearly all components of liquid air.
William Ramsay was awarded the 1904 Nobel Prize in Chemistry for discovery of a series of noble gases, including krypton.
Electroni pe nivelul de energie
2, 8, 18, 8
Configurație electronică
[Ar] 3d10 4s2 4p6
When ionized, krypton gas emits bright white light
Proprietăți Fizice
Fază
Gaz
Densitate
0,003733 g/cm3
Punct de topire
115,79 K | -157,36 °C | -251,25 °F
Punct de fierbere
119,93 K | -153,22 °C | -243,8 °F
Energie de fuziune
1,64 kJ/mol
Energie de evaporare
9,02 kJ/mol
Căldură specifică
0,248 J/g·K
Abundența în scoarța Pământului
1,5×10-8%
Abundența în Univers
4×10-6%
Numarul CAS
7439-90-9
Număr CID PubChem
5416
Proprietăți Atomice
Rază atomică
88 pm
Rază de covalență
116 pm
Electronegativitate
3,00 (Scara lui Pauling)
Potențial de ionizare
13,9996 eV
Volum molar
38,9 cm3/mol
Conductivitate termică
0,0000949 W/cm·K
Număr de oxidare
2
Aplicații
Krypton is used in certain photographic flash lamps for high-speed photography.
Krypton-83 has application in magnetic resonance imaging (MRI) for imaging airways.
Krypton is used as a filling gas for energy-saving fluorescent lights and as an inert filling gas in incandescent bulbs.
Krypton-83 has application in magnetic resonance imaging (MRI) for imaging airways.
Krypton is used as a filling gas for energy-saving fluorescent lights and as an inert filling gas in incandescent bulbs.
Krypton is considered to be non-toxic
Izotopi
Izotopi stabili
78Kr, 80Kr, 82Kr, 83Kr, 84Kr, 86KrIzotopi instabili
69Kr, 70Kr, 71Kr, 72Kr, 73Kr, 74Kr, 75Kr, 76Kr, 77Kr, 79Kr, 81Kr, 85Kr, 87Kr, 88Kr, 89Kr, 90Kr, 91Kr, 92Kr, 93Kr, 94Kr, 95Kr, 96Kr, 97Kr, 98Kr, 99Kr, 100Kr, 101Kr