安徽省2019年中考化学复习第一篇基础过关篇专项01化学用语课件.pptx

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PART ONE,第一篇 基础过关篇,专项(一)化学用语,【考点突破】,1.元素符号的意义 (1)宏观:表示一种元素(若物质的化学式与元素符号相同时,则还表示这种物质)。如O表示 ;Fe表示 ; 。 (2)微观:表示一个原子。如O表示 。元素符号前面加上化学计量数,该符号表示原子个数。如2O表示 。,2.元素周期表中的一个单元格,图G1-1,氧元素,铁元素,铁这种物质,一个氧原子,2个氧原子,原子序数,元素符号,元素名称,3.原子结构示意图,图G1-2,4.化学式的意义,一种物质,元素组成,一个分子,原子构成,最简个数比,5.元素符号周围数字的含义,图G1-3,

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