Na(+) is the sodium cation. It is positive, because it has lost one electron.
The ion contains 11(+) protonsd and 10 (-) electrons . Hence
+11-10 = +1 ( usually shown as '+'.
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positive (+ is always positive)
This means it's an ion, because it's lacking one valence electron
Sodium, Na, is a group 1 element and generally holds a +1 charge.
positive
positive plus positive equals positive negative plus negative equals negative
negative plus positive equals to zero
Because "minus a negative" is tha same as "plus a positive". So, a positive minus a negative is a positive plus a positive which is a positive.