kobalt, nikel birikmalarining biologik ahamiyati

name of presentation kobalt, nikel birikmalarining biologik ahamiyati kobalt (cobaltum), co — mendeleyev davriy sistemasining viii guruhiga mansub kimyoviy element. tartib raqami 27, atom massasi 58,9332. kobalt metalini ilk bor 1735-yilda shved kimyogari yu. brand rudalardan ajratib olgan. uzoq, vaqtgacha kobaltni rudadan ajratib olish mumkin boʻlmagan, shuning uchun kobold deb atalgan (nem. kobold togʻ va konlarda yashaydigan jin demakdir; metall kobalt nomi shundan olingan). nikel (nem. nikel, lot. niccolum), ni — mendeleyev davriy sistemasining viii guruhiga mansub kimyoviy element. tartib rakami 28, atom massasi 58,69. tabiiy nikel 5 ta barqaror izotop 58ni (67,88%), 60ni (26,23%), 61ni (1,19%), 62ni (3,66%) va mni (1,04%) aralashmasidan iborat. eng uzoq mavjud boʻluvchi sunʼiy radioa...

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