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A atom gain or lose electrons to complete its outermost shell

i have a question regarding this.
for e.g
Na has 11 electrons
when it loses its electron then it also loses its proton? if not then how could it stable.
because no. of electrons is =no. of protons



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the stability of an atom depends only on no. of outermost electrons and when an electron is removed there is no change in the no of protons,they remain the same.it is not that neutral atoms are stable ,even ions having octet configuration can be stable.
An atom having equal no of electrons and protons is electrically neutral but need not to be stable.
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