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可能用到的数据原子量:H 1 C 12 N 14 O 16 一、选择题(每小题1分,共5分。每小题只有一个选项符合题意。) 1.1992年,我国取得的重大科技成果之一是发现了三种元素的新的同位素,其中一种是_80~(208)Hg,它的中子数是 (A) 80 (B) 128 (C) 208 (D) 208 B 2.暂时硬水煮沸后的水垢主要是 (A) Ca (HCO_3)_2 (B) Ca (OH)_2 (C) MgCO_3 (D) Mg (OH)_2和CaCO_3 D
The atomic weight of data that may be used: H 1 C 12 N 14 O 16 First, multiple-choice questions (1 point for each question, total 5 points. There is only one option for each question is consistent with the question.) 1. In 1992, China achieved major scientific and technological achievements One is the discovery of new isotopes of three elements, one of which is _80~(208)Hg, and its neutron number is (A) 80 (B) 128 (C) 208 (D) 208 B 2. The scale after the temporary boiling in hard water is mainly (A) Ca (HCO_3)_2 (B) Ca (OH)_2 (C) MgCO_3 (D) Mg (OH)_2 and CaCO_3 D