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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