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D.I. Mendeleyevning qonuniy atom massalarining joylashtirish tartibi qaysi?
Berilliy Be elementining xossalari haqida qanday ma'lumotlar berilgan?
Uglerod C elementining valentligi qancha ga bo'lgan?
Ftor F elementining valentligi qancha ga?
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Natriy Na elementidan oldingi qator elementlar xossalarining takrorlanish tartibi nima?
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Natriyning metallik xossalari qancha kuchli ifodalangan?
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Kremniy Si elementining valentligi nechanchi darajedan kam?
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Kaliydan boshlab, tipik ishqoriy metalldan tipik metallmas galogenga qadar xossalarining asta-sekin o‘zgarishi nima bo‘yicha kuzatiladi?
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Litiyning oksidi qanday shaklda bo‘ladi?
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Natriyning xossalari qaysi xossaga o‘xshash?
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