11.根据元素的化合价书写氧化铝的化学式.(1)写出组成氧化铝的元素符号.显正价的元素符号在前.显负价的元素符号在后,(2)在元素符号的正上方标出元素的化合价:$\stackrel{+3}{Al}\stackrel{-2}{O}$,(3)将元素化合价的绝对值交叉:,(4)化简.将元素符号右下角的公约数约去.
Richard Rodgers: Blue Moon (COMPLETE) for Choral Pax, easy/intermediate sheet music. Licensed to Virtual Sheet Music® by Alfred® publishing company. NOTE: This is just a sample of this item, buy this item to display the complete music. Download the PDF sample file$...