periodic table

简明释义

周期表

英英释义

例句

1.Chemists use the periodic table 元素周期表 as a fundamental tool in their research.

化学家在研究中使用元素周期表 periodic table 作为基本工具。

2.The periodic table 元素周期表 helps predict the chemical behavior of elements.

元素周期表periodic table 有助于预测元素的化学行为。

3.The periodic table 元素周期表 is organized by increasing atomic number.

元素周期表periodic table 是按原子序数递增排列的。

4.Students learn to identify elements using the periodic table 元素周期表 during their science experiments.

学生们在科学实验中学习使用元素周期表 periodic table 来识别元素。

5.In chemistry class, we often refer to the periodic table 元素周期表 to understand the properties of different elements.

在化学课上，我们经常引用元素周期表 periodic table 来理解不同元素的性质。

作文

The periodic table is one of the most significant achievements in the field of chemistry. It organizes all known chemical elements in a systematic way, providing scientists and students with a comprehensive tool for understanding the relationships between different elements. The layout of the periodic table is not arbitrary; instead, it reflects the underlying atomic structure of the elements. Each element is placed in a specific location based on its atomic number, which is the number of protons in its nucleus. This organization allows us to predict the properties of elements and how they will react with one another.The history of the periodic table dates back to the 19th century when Dmitri Mendeleev, a Russian chemist, first published a version of it in 1869. Mendeleev’s table was revolutionary because he arranged the elements by increasing atomic mass and grouped them according to similar chemical properties. This arrangement led to the prediction of the existence and properties of elements that had not yet been discovered, demonstrating the predictive power of the periodic table.In modern times, the periodic table has evolved to include over 100 elements, each with unique characteristics. The elements are divided into categories such as metals, nonmetals, and metalloids. Metals, which are found on the left side and in the center of the table, are typically good conductors of heat and electricity. Nonmetals, located on the right side, often have more varied properties and can be poor conductors. Metalloids, which have properties intermediate between metals and nonmetals, are found along the zigzag line that divides these two categories.One of the most fascinating aspects of the periodic table is the periodicity of the elements. This term refers to the recurring trends that can be observed in the properties of elements as you move across or down the table. For example, as you move from left to right across a period, the atomic radius tends to decrease while electronegativity increases. These trends help chemists understand how elements interact with each other, which is crucial for predicting the outcomes of chemical reactions.Furthermore, the periodic table serves as a foundation for advanced studies in chemistry and related fields. It provides essential information for various applications, including materials science, pharmacology, and environmental science. Understanding the properties of elements allows researchers to design new materials, develop pharmaceuticals, and address environmental issues.In conclusion, the periodic table is more than just a chart of elements; it is a vital tool that encapsulates the essence of chemistry. Its systematic organization reveals the relationships between elements and their properties, making it an indispensable resource for scientists and students alike. As we continue to explore the world of chemistry, the periodic table will undoubtedly remain a central feature in our quest for knowledge about the natural world.

元素周期表是化学领域最重要的成就之一。它以系统的方式组织所有已知的化学元素，为科学家和学生提供了一个全面的工具，以理解不同元素之间的关系。元素周期表的布局并不是随意的；相反，它反映了元素的基本原子结构。每个元素根据其原子序数（即其原子核中的质子数量）放置在特定的位置。这种组织使我们能够预测元素的性质以及它们如何相互反应。元素周期表的历史可以追溯到19世纪，当时俄罗斯化学家德米特里·门捷列夫在1869年首次发布了它的一个版本。门捷列夫的表是革命性的，因为他按原子质量递增排列元素，并根据相似的化学性质将它们分组。这种排列导致了对尚未发现的元素存在及其性质的预测，展示了元素周期表的预测能力。在现代，元素周期表已经发展到包括100多个元素，每个元素都有独特的特性。元素被分为金属、非金属和类金属等类别。金属通常位于表的左侧和中间，通常是良好的热和电导体。非金属位于右侧，往往具有更多的多样化特性，可以是较差的导体。类金属则具有介于金属和非金属之间的性质，位于将这两类元素分开的锯齿线沿线。元素周期表最迷人的方面之一是元素的周期性。这个术语指的是在你横向或纵向移动表时观察到的元素性质的重复趋势。例如，当你从左到右移动一个周期时，原子半径往往会减小，而电负性会增加。这些趋势帮助化学家理解元素之间的相互作用，这对于预测化学反应的结果至关重要。此外，元素周期表作为化学及相关领域高级研究的基础。它为各种应用提供了必要的信息，包括材料科学、药理学和环境科学。理解元素的性质使研究人员能够设计新材料、开发药物并解决环境问题。总之，元素周期表不仅仅是一个元素的图表；它是一个重要的工具，概括了化学的本质。它的系统组织揭示了元素及其性质之间的关系，使其成为科学家和学生不可或缺的资源。随着我们继续探索化学世界，元素周期表无疑将继续在我们对自然世界知识的追求中占据中心地位。