An element is a gas at room temperature, it is very reactive and its symbol is O. What is its English name? A. Oxygen B. Nitrogen C. Fluorine D. Neon 相关知识点: 试题来源: 解析 A。解析:在室温下为气体,化学符号为O且化学性质活泼的元素是Oxygen(氧)。Nitrogen(氮)的符号是N,Fluorine(...
Nitrogen fixation would have evolved whenever the demand of fixed nitrogen exceeded the supply. Nitrogen is an essential element for life. It is present in all living systems, occurring in several important molecules including proteins and nucleic acids. As a consequence, the origin of the nitrogen...
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Which element is a noble gas and has the symbol "Ne"? A. Neon B. Nickel C. Nitrogen D. Sodium 相关知识点: 试题来源: 解析 A。解析:Neon(氖)是一种惰性气体,符号为“Ne”。B选项Nickel(镍),符号为“Ni”;C选项Nitrogen(氮),符号为“N”;D选项Sodium(钠),符号为“Na”,所以答案为A。
B. Nitrogen Cycle ? Nitrogen is an essential element in the synthesis of proteins. The cyclic flow of nitrogen in Nature is known as the nitrogen. o During a process called nitrogen fixation, atmospheric nitrogen is changed to nitrates in the soil.This process is carried out by a group of...
百度试题 结果1 题目Which element is a metal? A. Oxygen B. Chlorine C. Sodium D. Nitrogen 相关知识点: 试题来源: 解析 C。氧气(Oxygen)、氯气(Chlorine)和氮气(Nitrogen)都属于非金属元素,钠(Sodium)是金属元素。反馈 收藏
Nitrogen is a gas. Byanon161881— On Mar 21, 2011 So is nitrogen a solid, liquid, or gas? That's all i want to know. Byanon48387— On Oct 12, 2009 Anon46939: Nitrogen is not compoosed of raw materials. It is an element. Therefore, it *is* the raw material. ...
What is an element? What is a free radical?Atom:The smallest part of a living or non-living thing consists of a central nucleus surrounded by one or more electrons is called an atom. The number of protons present in the nucleus of an atom is designated as an atomic number of an ...
百度试题 结果1 题目The element with atomic number 1 is ___. A. hydrogen B. oxygen C. nitrogen D. carbon 相关知识点: 试题来源: 解析 A。原子序数为 1 的元素是氢(hydrogen)。