38
Sr
87.62
Strontium (Sr)
Element 38 · Period 5 · Group 2
alkaline-earth
solid at room temp
s-block
About Strontium
Produces red color in fireworks. Sr-90 is a dangerous radioactive fission product.
Physical Properties
Atomic Mass
87.62 u
State at 25°C
Solid
Melting Point
777 °C
Boiling Point
1382 °C
Density
2.64 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Kr] 5s²
Electron Shells
2, 8, 18, 8, 2
Electronegativity
0.95
Atomic Radius
219 pm
Ionization Energy
550 kJ/mol
Oxidation States
+2
Discovery & History
Discovered By
Adair Crawford
Discovery Year
1790
Named By
Humphry Davy
Name origin: Strontian, Scotland
Frequently Asked Questions
- Is Strontium a metal, nonmetal, or metalloid?
- Strontium is classified as a alkaline-earth.
- What state is Strontium in at room temperature?
- Strontium is a solid at standard room temperature (25°C).
- What is the atomic mass of Strontium?
- Strontium has an atomic mass of 87.62 atomic mass units (u).
- Who discovered Strontium?
- Strontium was discovered by Adair Crawford in 1790.
- Where is Strontium on the periodic table?
- Strontium is element number 38, located in period 5 and group 2.