12 - Magnesium alkaline earth metal
Discovered by Joseph Black in 1755
- Atomic Radius (Å)
Magnesium is a chemical element with symbol Mg and atomic number 12. It is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (Group 2, or alkaline earth metals) of the periodic table:they each have the same electron configuration in their outer electron shell producing a similar crystal structure. Magnesium is the ninth most abundant element in the universe.
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 2 | 2 in 3s |
24.3 u
Atomic Mass
1.7 Å
Atomic Radius
1363 K
Boiling Point
1.41 Å
Covalent Radius
1.74 g/cm³
Density
-4.00e+1
Electron Affinity
1.31
Electronegativity
7.65 eV
First Ionization Energy
923.15 K
Melting Point
3
Number of Shells
2
Electron Valency
12
Atomic Number
2, 8, 2
Electron Shell Occupations
1.02 J/(g K)
Specific Heat
