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8-sinf Kimyo olimpiada №3

Yanvar 3, 2023

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8-sinf Kimyo olimpiada №3

30.12.2022 yil oo.uzedu.uz

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Elektron formulasi 3d¹⁰4s²bo’lgan element qaysi davrva guruhda joylashgan?

3 davr I guruh

4 davr II guruh

4 davr I guruh

5 davr II guruh

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Odam o’pkasida havo pufakchalari (alveolalar)ning 700 millioniga 3l havo sig’adi. 5ta alveoladagi azot molekulalari sonini hisoblang (azotning havodagi hajmiy ulushi=0.8)

7*10¹³

5,7*10¹⁶

7,5*10¹⁵

4,6*10¹⁴

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C

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