Recommended Lessons and Courses for You Related Lessons Related Courses Common Elements Lesson for Kids: Names & Symbols Elements, Compounds & Molecules | Differences & Examples Elements in Chemistry | Overview & Examples What is Atomic Radius? | Atomic Radius Examples & Periodic Trend ...
When writing chemical equations, we use symbols to represent elements and compounds. For example, H₂O represents water ___ CO₂ represents carbon dioxide. A. and B. or C. but D. so 相关知识点: 试题来源: 解析 A。“H₂O 代表水,并且 CO₂ 代表二氧化碳”,表示并列关系用 and。
CHEMICAL SYMBOLS AND ELEMENTSELSEVIERMoon Rocks and Minerals
Many elements have their symbol derived from either the first letter [e.g., N for Nitrogen] or the first two letters [e.g., Ne for Neon] of their names. A few elements have symbols derived from their Latin names [e.g., the symbol for Lead is Pb, short for Plumbum]. Click here...
Many elements have their symbol derived from either the first letter [e.g., H for Hydrogen] or the first two letters [e.g., He for Helium] of their names. A few elements have symbols derived from their Latin names as given in the table below. Element Symbol Latin Name Antimony Sb ...
百度试题 结果1 题目We must know such symbols ___ are used to represent chemical elements. A. that B. which C. they D. as 相关知识点: 试题来源: 解析 D) as 反馈 收藏
(1) Only recognized element symbols may be used. (2) Each element symbol is followed by a ‘count’ number. A count of ‘1’ may be omitted. (3) A space or parenthesis must separate each cluster of (element symbol + count). (4) Where a group of elements is enclosed in parentheses...
Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form
解析 D 在"such+n.+as"或"such as+…”或"the same+…+as"或"as+adj.+a/an+n.+ as"结构中,as作关系代词,引导定语从句,as在定语从句中可以作主语、宾语或表语,如:Ultrasonic sound is such as is inaudible to human ear.超声波是一种人耳听不到的声音。
Substances made up of a single type of atom are called Elements. Some elements are made up of single atoms:Atom Symbol Helium He Carbon C Sodium Na Sulphur S Iron Fe He, Fe, and Na are the Chemical Symbols of the elements. Some elements are made up of groups of atoms:...