umumiy yangi-1

“davriy sistema hech qachon inkor qilinmaydi, balki, doimo takomillashib boradi!” d.i.mendeleyev d a v r q a t o r elementlarning guruhlari a i b ishqoriy metallar a ii b ishqoriy-yer metallar a iii b bor guruhchasi a iv b karbogenlar a v b nitrogenlar a vi b halkogenlar a vii b galogenlar b viii a inert gazlar yoki nodir gazlar i 1 2 4,003 ii 2 3 6,94 4 9,012 5 10,81 6 12,01 7 14,0067 8 15,9994 9 18,998 10 20,179 iii 3 11 22,99 12 24,305 13 26,98 14 28,086 15 30,97 16 32,06 17 35,453 18 39,948 iv 4 19 39,098 20 40,08 21 44,956 22 47,9 23 50,94 24 51,996 25 54,938 26 55,8 27 …

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