According to this invention, there is provided an indole derivative having the general formula (I) wherein A is an oxygen atom or a nitrogen atom which nitrogen atom is optionally substituted with an alkyl group, and (i) R 1 and R 2 each stand for a hydrogen atom or an alkyl group, ...
CO2 is ___ one carbon atom(碳原子)and two oxygen(氧)atoms. A. made from B. made of C. made up of 相关知识点: 试题来源: 解析 C [详解] 句意:CO2有一个碳原子和两个氧原子组成。 考查动词短语。A. made from表示由……制成,看不出原材料;B. made of表示由……制成,可以看出原材料;...
The oxygen atom is nearly___ the hydrogen atom.相关知识点: 试题来源: 解析 16 times as heavy as15 times heavier than16 times the weight of 解析: 第7题需要填入介词,根据句意和固定搭配,应填入“For”,表示“因此”。 第8题需要填入动词的-ing形式,构成“keep doing sth.”结构,表示“继续做某事...
aTell me whyAm I the one your all belongs to- why me? null[translate] aso you lader 如此您lader[translate] aAn atom of sulfur is 32 times heavier than an atom ot hydrogen, or twice as heavy as an atom of oxygen. 硫磺原子比原子ot氢32次重或者两次重作为氧气原子。[translate]...
Each kind of atom makes up a pure substance called an element. You may have heard of oxygen, lead, and gold. Well, these are all examples of elements. Can you believe that a pure gold necklace is made up of billions of gold atoms? View Video Only Save Timeline Video Quiz ...
What does a Lewis electron-dot diagram for an atom of sulfur-33 look like? The orbital diagram for a ground-state oxygen atom is? What is the type of diagram that consists of the valence electrons surrounding the chemical symbol of the element?
An atom is a piece of matter that exists in all substances that can physically be touched. An atom contains three kinds of particles: protons, neutrons and electrons. The protons and neutrons create the nucleus while the electrons fly around and above th
The mass number of an atom is the total number of protons and neutrons contained within the nucleus of the atom. The number of protons determines the element and will always equal the atomic number of that element. The number of neutrons can change and will determine which isotope of that ...
By Anne Marie Helmenstine, Ph.D. An oxyanion is ananioncontainingoxygen. The general formula of an oxyanion is AxOyz-, where A is an element symbol, O is an oxygen atom, and x, y, and z are integer values. Most elements can form oxyanions, meeting the conditions of the octet rule....
ATOM RPGAbiotic FactorAgainst the StormAge of Empires II: Definitive EditionAge of Empires II: HD EditionAge of Empires III: Definitive EditionAge of Empires® III: Complete CollectionAge of Wonders 4Age of Wonders: PlanetfallAge of Wushu...