ВАЛЕНТНIСТЬ хпЛчних ЕЛЕМЕНПВ

з

                                                                                                       НР, Nap

       п                              о, ве, мд, са, ва, Zn мдо, Сао

III                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 A1203

3i

I                  i II си    сир, Сио

II         III      Ре, со, Ni  FeO,

II              IV   Sn, РЬ SnO, sn02

III        I V  р   рнз, Р203

II, III VI                         CrO, crP3, cr03

H2S, S02,