問題詳情
17. 已知週期表上原子序2~20中的元素所含的中子與質子的數目約略相同。若元素X的質量數為19，試問X最可能為下列哪一個元素？
(A) N
(B) O
(C) F
(D) Na
(A) N
(B) O
(C) F
(D) Na
參考答案
答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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