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Atomic Structure

Names of Ionic Compounds.

The names of metal elements do not change
when they become ions.
If you do not know whether an element is
a metal or a non-metal see the periodic table.

Metals form positively charged ions called cations.
Examples are
Li+, Na+, K+, Mg2+, Ca2+, Al3+.
The above ions are called
lithium, sodium, potassium,
magnesium, calcium and  aluminium.

The names of non-metal elements
do change when they become ions.
Non-metals form negatively charged ions called anions.
Examples are
F-, Cl-, Br-, I-, O2-, S2-.
If there is only 1 non-metal in the ionic compound
the name ends in ide.
The above ions are called
fluoride, chloride, bromide, iodide, oxide and sulfide.

So,  lithium + chlorine  arrow lithium chloride.
2Li(s)  +    Cl2(g)   arrow           2LiCl(s)

potassium + bromine  arrow potassium bromide.
2K(s)  +    Br2(l)   arrow           2KBr(s)

If there are 2 non-metals and the second one is oxygen
the name ends in ate.

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