Magnesium (Mg)

From Wikipedia, the free encyclopediaMagnesium 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.

Magnesium in the periodic table

SymbolMg
Atomic number12
Group2
Period3
Blocks
Element categoryAlkaline Earth Metal

Physical properties

Phase at STPSolid
Density1.738 g/cm3
Atomic weight24.305 u
Melting point923 K
649.85 °C
1201.73 °F
Boiling point1363 K
1089.85 °C
1993.73 °F

Atomära egenskaper

Electronegativity (Pauling Scale)1.31
Electron affinity-40 kJ/mol
Ionization energies
1737.7 kJ/mol
2 1450.7 kJ/mol
3 7732.7 kJ/mol
4 10542.5 kJ/mol
5 13630 kJ/mol
6 18020 kJ/mol
7 21711 kJ/mol
8 25661 kJ/mol
9 31653 kJ/mol
10 35458 kJ/mol
11 169988 kJ/mol
12 189368 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2
Electrons per shell2, 8, 2

History

Discovered1755
Discovered byJoseph Black