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Compare a sodium ion to a) a sodium atomb) a neon atom

User Rityzmon
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We will start with a Sodium Atom:

This is a Na atom. It has 11 electrons on the shells and 11 protons in the nucleus (blue circle)

Metals as Na can lose electrons from the last shell and it becomes an Ion with a positive charge.

Red dots are electrons. The second picture is from Ion Na and it is called cation because it has a positive charge.

If we draw a neon atom, you will see that it has the same configuration of Na ion, but Neon is a noble gas and it has not a charge:

Compare a sodium ion to a) a sodium atomb) a neon atom-example-1
Compare a sodium ion to a) a sodium atomb) a neon atom-example-2
User Mlambie
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