试题来源: 解析 B。把化学元素符号“O”和以“O”开头的物体联系起来是一种有效的记忆方法,因为这样可以通过联想帮助记忆。选项 A 多次重复可能会比较枯燥且效果不一定好。选项 C 只写下来一次可能记不住。选项 D 随机记忆没有系统性,很难记住。反馈 收藏 ...
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Which element has the largest atomic radius? a. Ca b. Sr c. Cr d. P Which of the following elements has the smallest atomic size? a. N b. P c. As Which element in the 8th column of the periodic table has the largest radius? Which chemical element has the highest number of...
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Which element has the second-highest electronegativity? ___. Electronegativity: The electronegativity of an atom of an element is a measure of the force with which the atom pulls on the shared electrons in a covalent bond. The index is important to investigate t...
Lead is a chemical element with the symbol Pb (from the Latin plumbum) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is silvery with a hint of blue...
Re: Which symbol do you use to represent "molten state" in a chemical reaction? « Reply #6 on: April 23, 2021, 07:05:50 PM » On paper or ms word i would use lower case script L, but i find the lower case "L" to be easily mistaken for numeral 1 in online digital font...
Leada chemical element with the symbol Pb (from the Latin plumbum) and atomic number 82. Ita heavy metal thatdenser than most common materials. Leadsoft and malleable, and also has a relatively low melting point. When freshly cut, leadsilvery with a hint of blue; it tarnishes to a dull ...
An element has the electron configuration [Kr] 5s24d105p2. The element is: a. nonmetal b. transition element c. metal d. lanthanide e. actinide An element has 35 electrons. In which period of the periodic table is this element located?
Which element is present in all organic compounds? (a) Carbon. (b) Nitrogen. (c) Oxygen. (d) Phosphorus. Organic Compounds: Organic compounds are chemical structures held together by bonds. These organic compounds can take on may different shapes, sizes, fu...