(physics and chemistry) the simplest structural unit of an element or compound Atom (philosophy) In logical atomism, a fundamental fact that cannot be further broken down. Molecule (nontechnical usage) a tiny piece of anything Atom (historical) The smallest medieval unit of time, equal to fiftee...
molecule - (physics and chemistry) the simplest structural unit of an element or compound free radical, radical - an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an ...
书上说element 是由一种atom组成的 然后有的atom连接在一起成为了molecule 就是说 element是由一种atom 或者molecule组成的吗?那像air和nitrigen dioxide那些东西 是不是不是mixture就是compound? 相关知识点: 试题来源: 解析 元素是指由同一种原子构成的物质.一种元素中的所有原子都包含有相同数量的质子.元素就...
the smallest particle of anelementthat has all the properties of the element. adj.,adjatom´ic.ƒThere are two main parts of an atom: thenucleusand theelectroncloud. The nucleus is made up ofprotons, which carry a positive electrical charge, and (except in hydrogen)neutrons, which contai...
Blocks of Matter Matter may consist of elements, compounds, or mixtures. Element: a substance made of only one type of atom Compound: a substance made of two or more elements chemically bonded together. Mixture: a physical combination of two or more pure substances (i.e., elements or ...
a我想我们应该节约用水,做到人人有责 I thought we should save the water used, achieves everybody has a responsibility[translate] aa.概念:元素、原子、分子、化合物、同位素、元素周期律; a. concept: Element, atomic, molecular, compound, isotope, period of element law;[translate]...
Molar mass is the mass of Avogadro's number of atoms of that element or compound. Avogadro's number is 6.02 x 1023 and can be used to represent the number of representative particles of any particle on the atomic scale. The molar masses of the elements are listed on the periodic table....
Pure substances are matter that is only made up of one type of element or compound. For instance, a vial of liquid hydrogen would contain a pure substance. A vial of water would also be a pure substance.What is Matter Composed Of? Lesson Summary Register to view this lesson Are you a ...
Fluorescence properties of 1 – 3 were studied in the solid state and in solution; for compound 3 phosphorescence (lifetime is 4.58 ms) is observed in the solid state. 展开 年份: 2015 收藏 引用 批量引用 报错 分享 全部来源 求助全文 ACS 相似文献 参考文献Compounds of Group 14 Elements with...
Examples of substances that are not atoms include water (H2O),table salt(NaCl), and ozone (O3). Basically, any material with a composition that includes more than one element symbol or that has a subscript following anelement symbolis a molecule or compound rather than an atom....