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一、选择题(每小题只有一个选项符合题意)。1.元素的化学性质主要取决于()。A.原子量B.价电子构型C.质子数D.核内中子数2、下列物质的电子式正确的是()。A.H;C1:O:B.H‘[;C1:)C.H;S:D.:O:C:O:
First, multiple-choice questions (only one option for each question is consistent with the meaning of the question). 1. The chemical properties of the elements mainly depend on (). A. Atomic weight B. Valence electron configuration C. The number of protons D. The number of neutrons in the nucleus 2 and the electrons of the following substances are correct (). A. H;C1:O:B. H‘[;C1:)C. H;S:D. :O:C:O: