Ответ:
Li,Be,B,C,N,O,F,Ne
3.Be,Mg,Ca,Zn,Sr,Cd,Ba,Hg,Ra
4.N,P,V,As,Nb,Sb,Ta,Bi,Db
5.Cr,Se
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Ответ:
Li,Be,B,C,N,O,F,Ne
3.Be,Mg,Ca,Zn,Sr,Cd,Ba,Hg,Ra
4.N,P,V,As,Nb,Sb,Ta,Bi,Db
5.Cr,Se