Một nguyên tố X có thể tạo thành với Al hợp chất kiểu AlaXb : một phân tử gồm 7 nguyên tử tỉ lệ khối lượng của x và al là 1:1,29.Xác định CTHH của h/c,gọi tên

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XV Reorder the following words to make meaningful sentences. 1. many/ for/ especially/ festivals/ Thailand/ Water/ traditional/ is/ famous/ its/ the/ Festival. 2. festival/ they/ when/ have/ people/ traditional/ chance/ attend/ the/ will/ folk/ a/ music/ to/ Vietnamese/ games/ and/ history/ learn/ more/ enjoy/ about. 3. many/ by/ rather/ people/ however/ think/ is/ is/ that/ fast travelling/ it/ air-planes/ time-consuming. 4. although/ be/ new/ energy/ discovering/ sources/ will/ alternative/ the/ be/ energy/ world/ demands of/ we/ over-population/ cannot/ met. 5. surprise/ it/ as/ a/ that/ by/ came/ decided/ work/ big/ to/ he/ commute/ to/ bus. XV Reorder the following words to make meaningful sentences. 1. many/ for/ especially/ festivals/ Thailand/ Water/ traditional/ is/ famous/ its/ the/ Festival. 2. festival/ they/ when/ have/ people/ traditional/ chance/ attend/ the/ will/ folk/ a/ music/ to/ Vietnamese/ games/ and/ history/ learn/ more/ enjoy/ about. 3. many/ by/ rather/ people/ however/ think/ is/ is/ that/ fast travelling/ it/ air-planes/ time-consuming. 4. although/ be/ new/ energy/ discovering/ sources/ will/ alternative/ the/ be/ energy/ world/ demands of/ we/ over-population/ cannot/ met. 5. surprise/ it/ as/ a/ that/ by/ came/ decided/ work/ big/ to/ he/ commute/ to/ bus. XV Reorder the following words to make meaningful sentences. 1. many/ for/ especially/ festivals/ Thailand/ Water/ traditional/ is/ famous/ its/ the/ Festival. 2. festival/ they/ when/ have/ people/ traditional/ chance/ attend/ the/ will/ folk/ a/ music/ to/ Vietnamese/ games/ and/ history/ learn/ more/ enjoy/ about. 3. many/ by/ rather/ people/ however/ think/ is/ is/ that/ fast travelling/ it/ air-planes/ time-consuming. 4. although/ be/ new/ energy/ discovering/ sources/ will/ alternative/ the/ be/ energy/ world/ demands of/ we/ over-population/ cannot/ met. 5. surprise/ it/ as/ a/ that/ by/ came/ decided/ work/ big/ to/ he/ commute/ to/ bus.