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h2 = 2 hidro , ==> h2 + v2 = 1*2 + v2

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Đặt hoá trị của M là x

Theo quy tắc hoá trị, có \(x.1=I.3\rightarrow x=III\)

Vậy CTHH của Oxit kim loại M là \(M_2O_3\)

Có \(NTK_M.2+NTK_O.3=102\)

\(\rightarrow NTK_M.2+16.3=102\)

\(\rightarrow NTK_M=\frac{102-16.3}{2}==27đvC\)

The biggest supercluster known in the universe is the Hercules-Corona Borealis Great Wall.

TL

The biggest supercluster known in the universe is the Hercules-Corona Borealis Great Wall. It was first reported in 2013 and has been studied several times. It's so big that light takes about 10 billion years to move across the structure. For perspective, the universe is only 13.8 billion years old.

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#Kirito

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Èo, may rủi  :)))

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#Forever

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 a.  How many teachers are there in your school?

 b. Mary and Jane are students in this school.

 c. His school is small but it is in a big city.

 d. How many classrooms are there in Phong’s school?

 e. My school has four foors and my classroom is on the second floor.