15 times heavier: those C. 16 times as heavier; that D. 16 times as heavy; those 相关知识点: 试题来源: 解析 【答案】A 【解析】试题分析:考查倍数表达法。句意:氧原子是氢原子重量的16倍。is 16 times havier是倍数表达法,that代指weight,可知选A。考点:考查倍数表达法反馈 收藏 ...
1、The atomic weight of oxygen is___than ___of the hydrogen. A. 15 times heavier; that B. 15 times heavier: those C. 16 times as heavier; that D. 16 times as heavy; those 相关知识点: 试题来源: 解析 1、答案:A 解析: 考查倍数表达法和指示代词。句意:氧的原子量是氢的原子量的...
The atomic numbers of some of the most famous atoms are hydrogen (1), oxygen (8), carbon (6), nitrogen (7), and gold (79) as seen in the picture. The number in parenthesis is the atomic number and also the number of protons that would be in a single atom of that element. Eleme...
The number of atoms or other particles in a mole is the same for all substances. The mole is related to the mass of an element in the following way: one mole of carbon-12 atoms has 6.02214076 × 1023 atoms and a mass of 12 grams. In comparison, one mole of oxygen consists, by def...
百度试题 结果1 题目:The atomic weight of helium is ___ that of hydrogen. () A. heavier four times than B. four time heavier than C. than four times heavier D. four times heavier than 相关知识点: 试题来源: 解析 D 反馈 收藏
Elemental nitrogen can be used as an inert atmosphere for reactions requiring the exclusion of oxygen and moisture. In theliquid state, nitrogen has valuable cryogenic applications; except for the gaseshydrogen, methane,carbon monoxide,fluorine, and oxygen, practically all chemical substances have neglig...
If an atom with a mass number of 202 has 122 neutrons, it is an atom of which element? What is the difference between an atom and an element? The atomic number of oxygen is 8. What is the mass number of an oxygen atom with 7 neutrons?
OxygenOxygen IsotopesIsotope RatioAirBibliographiesIceMass NumberStandardsWaterThere is a problem with the absolute abundance measurements of oxygen. One of these calibrated measurements is in error, either oxygen in air, or oxygen in (V-SMOW), Vienna's standard mean ocean water reference material. ...
【题目】The atomic weight of oxygen is___than ___of the hydrogen. A. 15 times heavier; that B. 15 times heavier: those C. 16 times as heavier; that D. 16 times as heavy; those试题答案 在线课程 【答案】A 【解析】 试题分析:考查倍数表达法。句意:氧原子是氢原子重量的16倍。is 16...