Ответ:
7-Ar(N)=14;
12-Ar(Mg)=24;
13-Ar(Al)=29;
16-Ar(S)=32;
19-Ar(K)=39.
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Ответ:
7-Ar(N)=14;
12-Ar(Mg)=24;
13-Ar(Al)=29;
16-Ar(S)=32;
19-Ar(K)=39.