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First off sodium. Sodium is an alkali metal and when alkali metals react they lose an electron. When an atom loses an electron, it becomes positively charged. Chlorine is in the halogen family and when they react they gain one electron, when an atom gains an electron, it becomes negative charged.

So,

Sodium=Positive

Chlorine=Negative

I got this as an homework question yesterday, took like 5mins but i finally figured it out :)

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