Magnesium ion
Charge: 2+ · Type: Cation · Molar mass: 24.305 g/mol
Made of: magnesium
How it forms
Magnesium's two valence electrons are lost to give Mg2+ the electron configuration of neon. This ion is small for its charge, which makes it attract water molecules and other negative charges strongly.
Naming note
Mg2+ is called the magnesium ion. Like calcium, it needs no Roman numeral because magnesium forms only this one common ion.
Examples in compounds
Magnesium oxide
Magnesium sulfate
Magnesium hydroxide