An atom is a basic structural unit of matter, the smallest particle of an element ___ into chemical combination. A. that can enter B. can it enter C. when entering it can D. that E. nters can 相关知识点: 试题来源: 解析 A 答案:A 分析:that引导定语从句,element为先行词。the smalles...
An atom has three types of very tiny particles called protons, neutrons and electrons. The center of an atom is called the nucleus, and it is made up of protons and neutrons. The electrons in an atom fly around and above the nucleus in a cloud-like formation. The protons have a positiv...
In addition, where two N atoms occur in a compound, such as with phenylalkylpiperazines, the N atom on the longer alkyl chain appears to be more important. Thus, based on this study, the N atom is an important pharmacophoric element in the binding of phenylalkylpiperidines and phenyl...
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 ...
The antonym of “atom” is ___. A. molecule B. particle C. compound D. element 相关知识点: 试题来源: 解析 C。“atom”意为“原子”,“compound”意为“化合物”,与“atom”相对。“molecule”分子;“particle”粒子;“element”元素,都不是“atom”的反义词。反馈...
An elements is a substance which is made out of atoms that all have the same proton number. So an element can consist of multiple atoms (like oxygen which goes around in pairs). An atom consists of a nucleus and some electrons. Source: IGCSE Chemistry Share Cite Improve this answer Fo...
01This question is about atomic structure.Figure 1 represents an atom of element Z.Figure 1-B A十01.1Name the parts of the atom labelled A and B.Choose answers from the box.[2 marks]electron neutron nucleus proton A nucleus B electron01.2Which particle has the lowest mass?Choose the ...
Examples of nonpolar molecules include nitrogen, methane, ozone, and oxygen. These molecules are homonuclear or composed of atoms of only one element. Nonpolar molecules that are not homonuclear include carbon dioxide, methane, and toluene, and gasoline. Generally, carbon compounds are nonpolar, alt...
B. An atom is the smallest unit of matter that makes up an element. C. They need atomic clocks to help reset their time. D. Either way, we need a new time system for the moon. 3 How does the time differen...
1 The relative atomic mass of an element is always D A the mass of an atom of the element relative to i2 the mass of a carbon-12 atom. B the mass of an atom of the element relative to the mass of a hydrogen atom.□ C the weighted mean mass of an atom of the element relative...