What is the difference between sodium atom and sodium ion?

CBSE Class 9 CBSE Class 9 Science
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Sodium atom:
1.Sodium atom (Na) has eleven electrons in its shells.
2.Na is neutral.
Sodium ion:
1.Sodium ion ${{Na}^{+}}$ has ten electrons in its shells.
2.${{Na}^{+}}$ is a positively charged particle or cation.