Стронциум

38
Sr
Група
2
Периода
5
блок
s
Protons
Electrons
Neutrons
38
38
50
Општи Својства
Атомски број
38
Атомска тежина
87,62
Mass Number
88
Category
Земноалкален метал
Color
Silver
Radioactive
Не
Named after Strontian, a town in Scotland
Кристална структура
Face Centered Cubic
History
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.
Electrons per shell
2, 8, 18, 8, 2
Електронска конфигурација
[Kr] 5s2
Sr
Strontium metal turns yellow when exposed to air
Физички Својства
Фаза
Solid
Густина
2,64 g/cm3
Точка на топење
1050,15 K | 777 °C | 1430,6 °F
Точка на вриење
1655,15 K | 1382 °C | 2519,6 °F
Топлина на топење
8 kJ/mol
Топлина на испарување
137 kJ/mol
Specific Heat Capacity
0,301 J/g·K
Abundance in Earth's crust
0,036%
Abundance in Universe
4×10-6%
The
Кредити на слика: Wikimedia Commons (Alchemist-hp)
The chemical element strontium as a synthetic made crystals, sealed under argon in a glas ampoule
CAS Number
7440-24-6
PubChem CID Number
5359327
Атомски Својства
Атомски полупречник
215 pm
Ковалентен полупречник
195 pm
Електронегативност
0,95 (Полингова скала)
Ionization Potential
5,6949 eV
Atomic Volume
33,7 cm3/mol
Thermal Conductivity
0,353 W/cm·K
Oxidation States
1, 2
Applications
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
Isotopes
Stable Isotopes
84Sr, 86Sr, 87Sr, 88Sr
Unstable Isotopes
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