How many lone pairs are on the central atom in the ammonium ion?

This question the answer is listed as 0 {1:SHORTANSWER:=0}

This question has the answer as *0* {1:SHORTANSWER:=*0*}

This question has the answer as 0* {1:SHORTANSWER:=0*}

This question has the answer as *0 {1:SHORTANSWER:=*0}

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