Strontium

38
Sr
Golongan
2
Periode
5
Blok
s
Proton
Elektron
Neutron
38
38
50
Sifat Umum
Nomor atom
38
Massa atom
87,62
Nomor massa
88
Kategori
Logam alkali tanah
Warna
Perak
Radioaktif
Tidak
Named after Strontian, a town in Scotland
Struktur kristal
Kubik Berpusat-muka
Sejarah
Strontium was recognized as a new element in 1790 when Adair Crawford and his colleague William Cruickshank analyzed a mineral sample from a lead mine near Strontian, Scotland.

The element was eventually isolated by Sir Humphry Davy in 1808.

The isolation was done by the electrolysis of a mixture containing strontium chloride and mercuric oxide.
Elektron per kulit
2, 8, 18, 8, 2
Konfigurasi elektron
[Kr] 5s2
Sr
Strontium metal turns yellow when exposed to air
Sifat Fisika
Fase
Solid
Kepadatan
2,64 g/cm3
Titik lebur
1050,15 K | 777 °C | 1430,6 °F
Titik didih
1655,15 K | 1382 °C | 2519,6 °F
Kalor peleburan
8 kJ/mol
Kalor penguapan
137 kJ/mol
Kapasitas kalor molar
0,301 J/g·K
Kelimpahan di kerak bumi
0,036%
Kelimpahan di alam semesta
4×10-6%
The
Kredit Gambar: Wikimedia Commons (Alchemist-hp)
The chemical element strontium as a synthetic made crystals, sealed under argon in a glas ampoule
Nomor CAS
7440-24-6
PubChem CID Number
5359327
Sifat Atom
Jari-jari atom
215 pm
Jari-jari kovalen
195 pm
Elektronegativitas
0,95 (Skala Pauling)
Potensi Ionisasi
5,6949 eV
Volume atom
33,7 cm3/mol
Kondusivitas termal
0,353 W/cm·K
Bilangan oksidasi
1, 2
Aplikasi
The primary use for strontium is in glass for color television cathode ray tubes.

Strontium salts are used in flares and fireworks for a crimson color.

Strontium chloride is used in toothpaste for sensitive teeth.

Strontium oxide is used to improve the quality of pottery glazes.
Strontium's non-radioactive isotopes are considered non-toxic
Isotop
Isotop stabil
84Sr, 86Sr, 87Sr, 88Sr
Isotop tidak stabil
73Sr, 74Sr, 75Sr, 76Sr, 77Sr, 78Sr, 79Sr, 80Sr, 81Sr, 82Sr, 83Sr, 85Sr, 89Sr, 90Sr, 91Sr, 92Sr, 93Sr, 94Sr, 95Sr, 96Sr, 97Sr, 98Sr, 99Sr, 100Sr, 101Sr, 102Sr, 103Sr, 104Sr, 105Sr