12
Mg
24.305
Magnesium (Mg)
Element 12 · Period 3 · Group 2
alkaline-earth
solid at room temp
s-block
About Magnesium
Light structural metal. Central atom in chlorophyll. Essential for human metabolism.
Physical Properties
Atomic Mass
24.305 u
State at 25°C
Solid
Melting Point
650 °C
Boiling Point
1090 °C
Density
1.738 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Ne] 3s²
Electron Shells
2, 8, 2
Electronegativity
1.31
Atomic Radius
145 pm
Ionization Energy
738 kJ/mol
Oxidation States
+2
Discovery & History
Discovered By
Joseph Black
Discovery Year
1755
Named By
Humphry Davy
Name origin: Magnesia district in Greece
Frequently Asked Questions
- Is Magnesium a metal, nonmetal, or metalloid?
- Magnesium is classified as a alkaline-earth.
- What state is Magnesium in at room temperature?
- Magnesium is a solid at standard room temperature (25°C).
- What is the atomic mass of Magnesium?
- Magnesium has an atomic mass of 24.305 atomic mass units (u).
- Who discovered Magnesium?
- Magnesium was discovered by Joseph Black in 1755.
- Where is Magnesium on the periodic table?
- Magnesium is element number 12, located in period 3 and group 2.