- Elements = same number of electrons = react in a similiar way
- Mendeleev arranged elements - increasing atomic mass. Elements in the same period - same properties = similar electronic stucture.
Positive and negative ions ->held by electrostaic attraction
- Metals - positive ions - called cations
- Non - metals = negative ions -> anions
Negative ion -> ends in -ide, Negative ion containing oxygen -> ends in -ate
e. g pottasium bromide e.g. Magnesium carbonate
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