Magnesium is very important ion inside the cell after potassium. Out side the cell you have sodium with calcium. It will be interesting to note the position of these metals in periodic table.
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Magnesium can exist as an ion or an atom. In its natural state, magnesium is an atom, but it can form a magnesium ion by losing two electrons to have a full outer electron shell.
The equation for the formation of a magnesium ion from a magnesium atom involves the loss of two electrons. It can be written as: Mg (s) -> Mg2+ (aq) + 2e-
They form an Ionic compound.
The correct name of the ion Mg2+ is magnesium ion.
The formula for the magnesium ion is Mg^2+ and for the fluoride ion is F^-. Therefore, the formula for magnesium fluoride is MgF2.