8.元素�期表中第m号元素其原子的质量数为 n关于该元素的下列叙述中正确的是 A.其原子核内中子数和质子数都是 m B.其原子核内 Template




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tomski8.元素�期表中第m号元素其原子的质量数为 n关于该元素的下列叙述中正确的是 a.其原子核内中子数和质子数都是 coloring