What is an Ion?
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Chemistry
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9th - 12th Grade
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Hard
Kevin McElhinney
Used 6+ times
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8 Slides • 0 Questions
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What is an Ion?
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An Ion
An ion is an atom that has gained or lost an electron and produces an atom with a charge either positive or negative
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An Ion
If an atom gains an electron it forms a negative ion because gaining an electron is gaining a negative charge.
If an atom loses an electron it forms a positive ion because losing an electron is losing a negative charge.
The charge is about the balance between protons (positive charge) and electrons (negative charge).
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An Ion
As you can see here sodium (Na) loses an electron, giving it a full octet in its outer shell, and forms a positively charged atom or a positive ion also known as a cation.
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An Ion
As you can see here chlorine (Cl) gains an electron, giving it a full octet in its outer shell, and forms a negatively charged atom or a negative ion also known as an anion.
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An Ion
As you can see here calcium has 2 valence electrons. It would need to give up 2 electrons to form an octet in its outermost energy shell. When two electron are lost then a 2+ charged ion is formed.
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An Ion
As you can see here nitrogen needs 3 valence electrons to form an octet. It would need to gain 3 electrons to form an octet in its outermost energy shell. When three electrons are gained then a 3- charged ion is formed.
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You can use a chart like this to help you quickly find the charge of an ion.
What is an Ion?
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