username3440694
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are all metal ions positive and all non-metal ions negative? or can they vary?
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MexicanKeith
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(Original post by shai01)
are all metal ions positive and all non-metal ions negative? or can they vary?
Metals would generally form cations (positive ions) and non-metals would form anions (negative ions).

In most 'normal' ionic compounds (ie compounds you're likely to come across at GCSE or A-level) the metal will be the cation and the non metal the anion.

You can get metallic anions (eg alkalides) and non metallic cations (eg protons- which you should know about), but in ionic compounds you can go with metal=positive and non metal=negative in general
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Goldenshark
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As MexicanKeith said there are exceptions but for all practical purposes at GCSE, you can assume the general rule.
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Kallisto
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(Original post by shai01)
are all metal ions positive and all non-metal ions negative? or can they vary?
As a rule, metals have a positive charge, as MexicanKeith replied. Just because the metal atoms donate electrons what made them to a cation. The non-metal atoms in turn accept those electrons what made them to an anion (negative charge).

So, please note:

metal atoms -> donate electrons -> positive charge (cation)
non-metal atoms -> accept electrons -> negative charge (anion)
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