What is an atom? an ion? a cation? an anion? what oles do they play in minerals?

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A cation [katjɔ] (from the Greek cata- and iôn: "who goes") is an ion which, having yielded one or more electrons, carries one or more positive electric charges: conversely,

An anion (from the Greek ana: and iôn: "who goes") is an ion which, having gained one or more electrons, carries one or more negative electric charge (s)

Atom the smallest component of an element having the chemicalproperties of the element, consisting of a nucleus containingcombinations of neutrons and protons and one or more electronsbound to the nucleus by electrical attraction.

and its role,is The neutron as the proton is in the nucleus of the atom: it is a nucleon.

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An atom is the smallest particle of matter which can not divide further ,till retain the property of matter. when an atom lose or gain one election and the charge com on them .the ion with negative charge is called anion and the ion with positive charge is called cation .

atom is the smallest part of matter which have electron proton and neutron .when an atom lose or gain electron the become ion ,if they gain electron they become negatively charge which is called anion and when they lose electron they become positively charged and called cation .