Davriy jadvalda nechta element bor, 120, 118, 123, 134, Xromning oksidlanish darajasi, +7;+8;9, -8;+8;-6, +2;+3;+6, +1;+2;+5, Davriy jadvalda nechta qator bor, 11, 13, 34, 23, nechta guruh bor, 6, 5, 4, 7, Elektronni kim kashf qilgan nechanchi yil, Ibn Sino 1037 yil, J.Tomson 1897 yil, A.Beruniy 1048yi, Alisher Navoiy 1441 yil

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