Kripton

36
Kr
Golongan
18
Periode
4
Blok
p
Proton
Elektron
Neutron
36
36
48
Sifat Umum
Nomor atom
36
Massa atom
83,798
Nomor massa
84
Kategori
Gas mulia
Warna
Tak berwarna
Radioaktif
Tidak
From the Greek word kryptos, hidden
Struktur kristal
Kubik Berpusat-muka
Sejarah
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.
Elektron per kulit
2, 8, 18, 8
Konfigurasi elektron
[Ar] 3d10 4s2 4p6
Kr
When ionized, krypton gas emits bright white light
Sifat Fisika
Fase
Gas
Kepadatan
0,003733 g/cm3
Titik lebur
115,79 K | -157,36 °C | -251,25 °F
Titik didih
119,93 K | -153,22 °C | -243,8 °F
Kalor peleburan
1,64 kJ/mol
Kalor penguapan
9,02 kJ/mol
Kapasitas kalor molar
0,248 J/g·K
Kelimpahan di kerak bumi
1,5×10-8%
Kelimpahan di alam semesta
4×10-6%
Vial
Kredit Gambar: Images-of-elements
Vial of glowing ultrapure krypton
Nomor CAS
7439-90-9
PubChem CID Number
5416
Sifat Atom
Jari-jari atom
88 pm
Jari-jari kovalen
116 pm
Elektronegativitas
3,00 (Skala Pauling)
Potensi Ionisasi
13,9996 eV
Volume atom
38,9 cm3/mol
Kondusivitas termal
0,0000949 W/cm·K
Bilangan oksidasi
2
Aplikasi
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 is considered to be non-toxic
Isotop
Isotop stabil
78Kr, 80Kr, 82Kr, 83Kr, 84Kr, 86Kr
Isotop tidak stabil
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