Strontium

38
Sr
Kumpulan
2
Kala
5
Blok
s
Proton
Elektron
Neutron
38
38
50
Ciri-Ciri Am
Nombor atom
38
Berat atom
87.62
Nombor jisim
88
Kategori
Logam alkali bumi
Warna
Perak
Radioaktif
Tidak
Named after Strontian, a town in Scotland
Struktur hablur
Pusat Wajah Kubik
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.
Bilangan elektron per petala
2, 8, 18, 8, 2
Konfigurasi elektron
[Kr] 5s2
Sr
Strontium metal turns yellow when exposed to air
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
2.64 g/cm3
Takat lebur
1050.15 K | 777 °C | 1430.6 °F
Takat didih
1655.15 K | 1382 °C | 2519.6 °F
Haba pelakuran
8 kJ/mol
Haba pengewapan
137 kJ/mol
Muatan haba molar
0.301 J/g·K
Banyak pada kerak bumi
0.036%
Banyak pada alam semesta
4×10-6%
The
Kredit imej: Wikimedia Commons (Alchemist-hp)
The chemical element strontium as a synthetic made crystals, sealed under argon in a glas ampoule
Nombor CAS
7440-24-6
PubChem CID Number
5359327
Ciri-Ciri Atom
Jejari atom
215 pm
Jejari kovalen
195 pm
Keelektronegatifan
0.95 (Skala Pauling)
Kebolehan mengion
5.6949 eV
Isipadu atom
33.7 cm3/mol
Daya pengaliran terma
0.353 W/cm·K
Keadaan pengoksidaan
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