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, ...
An oxygen atom contains eight electrons, arranged into two orbital shells. Electron Situated within the two shells, these subatomic particles have a mass of almost zero and a charge of -1. Unpaired electron Two electrons in the outer shell don’t have a partner. This allows oxygen atoms to ...
The mass number of an oxygen atom with seven neutrons would be 15 and would be an atom of the oxygen-15 isotope. For all oxygen atoms, the nucleus...Become a member and unlock all Study Answers Try it risk-free for 30 days Try it risk-free Ask a question Our experts can answer...
The number of protons in an atom is unique to each element. For example,carbonatoms have six protons,hydrogenatoms have one andoxygenatoms have eight. The number of protons in an atom is referred to as the atomic number of that element. The number of protons also determines the chemical be...
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?
Atomsare the foundation of matter, which is everything that makes up the universe around us. 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 ...
aThe oxygen atom of the water molecule is more electronegative than the hydrogen atom (i.e., it attracts more the electrons). As a result, the side of the molecule with the oxygen atom has a partial negative charge. A molecule with such a charge difference is called a dipole.[translate]...
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
【题目】CO2 is ___ one carbon atom(碳原子)and two oxygen(氧)atoms. A.made fromB.made ofC.made up of试题答案 在线课程 【答案】C 【解析】 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;C....
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....