270 ta misolning yechimlari
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1. qaysi moddalar (elementlar) 1, 2, 3 valentlikni namoyon qiladi ? a) al, cu, fe b) cu, n, cl c) mn, co, fe d) cu, n 2. qaysi elementlar 3 va 5 valentlikni namoyon qila oladi ? a) n, p, cl b) as, p, n c) i, br, p d) n, cl, br 3. qaysi elementlar 1 va 3 valentlikni namoyon qila oladi ? a) ag, au, fe b) cu, au, cl c) cl, br, zn d) co, n, fe 4. qaysi elementlar 2, 4, 6 valentli bo‟la olmaydi ? a) s, te b) s, se c) cu, cl d) o,te 5. qaysi elementlar 2 va 4 valentli bo‟la oladi ? a) sn, pb, o b) c, o, br c) …
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