Answers

2014-05-29T17:29:13+08:00
They can have different number of neutrons. They are isotopes, isomers and ions. 
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2014-06-01T09:07:50+08:00
Different atoms of the same element can have a different number of electrons and neutrons

an atom with the same element but different number of electrons called an ions. And,
an atom with the same element but different number of neutrons called an isotopes
 
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