mendeleev's law

简明释义

门捷列夫周期律

英英释义

例句

1.In chemistry classes, we often refer to Mendeleev's law to explain the periodic table.

在化学课上，我们经常提到门捷列夫定律来解释周期表。

2.The arrangement of elements according to Mendeleev's law helps predict properties of unknown elements.

根据门捷列夫定律排列元素有助于预测未知元素的性质。

3.The discovery of Mendeleev's law revolutionized how we understand chemical elements.

发现门捷列夫定律彻底改变了我们对化学元素的理解。

4.Students learn about Mendeleev's law when studying the trends in the periodic table.

学生在学习周期表中的趋势时会学习门捷列夫定律。

5.According to Mendeleev's law of periodicity, elements are arranged based on their atomic mass.

根据门捷列夫定律，元素是根据其原子量排列的。

作文

The periodic table of elements is one of the most significant achievements in the field of chemistry, and it owes much of its structure to the pioneering work of Dmitri Mendeleev. His contributions laid the foundation for what is now known as mendeleev's law, which states that the properties of elements are a periodic function of their atomic weights. This means that when elements are arranged in order of increasing atomic weight, their chemical properties exhibit a recurring pattern. Understanding mendeleev's law not only helps us appreciate the organization of the periodic table but also provides insights into the relationships between different elements.Mendeleev first published his periodic table in 1869, and it was revolutionary at the time. He noticed that elements with similar properties appeared at regular intervals when sorted by atomic weight. For instance, he grouped elements like sodium and potassium together because they both share similar chemical behaviors. This observation led him to formulate his law, which suggested that there was an underlying order to the elements that could predict their properties based on their position in the table.One of the remarkable aspects of mendeleev's law is that it allowed Mendeleev to predict the existence and properties of elements that had not yet been discovered. For example, he left gaps in his table for these undiscovered elements and even predicted their atomic weights and properties with astonishing accuracy. The discovery of gallium and germanium in the years following the publication of his table confirmed his predictions, solidifying the validity of mendeleev's law.Mendeleev’s approach was not merely about organizing elements; it was also about understanding the relationships between them. By using mendeleev's law, chemists can predict how elements will react with one another, which is crucial for both theoretical and practical applications in chemistry. For instance, knowing that chlorine and sodium will react to form table salt (sodium chloride) is rooted in the periodic properties outlined by Mendeleev.However, it is important to note that Mendeleev’s law is not without its limitations. The modern periodic table is arranged by atomic number rather than atomic weight, which addresses some inconsistencies that Mendeleev encountered. Elements such as iodine and tellurium, for example, did not fit neatly into the pattern when arranged by atomic weight. This led to the realization that atomic number is a more accurate basis for categorizing elements, as it reflects the number of protons in an atom's nucleus.Despite these advancements, the essence of mendeleev's law remains relevant. It serves as a historical cornerstone for the development of modern chemistry and continues to influence how we understand chemical behavior today. The periodic table is not just a chart of elements; it is a dynamic tool that reflects the underlying principles of nature, many of which were first articulated by Mendeleev.In conclusion, mendeleev's law represents a fundamental principle in chemistry that has shaped our understanding of elements and their interactions. Its predictive power and the organization of the periodic table have paved the way for countless scientific advancements. As we continue to explore the complexities of matter, the legacy of Mendeleev reminds us of the importance of seeking patterns in nature and the profound connections that exist within the world of chemistry.

元素周期表是化学领域最重要的成就之一，它在很大程度上得益于德米特里·门捷列夫的开创性工作。他的贡献奠定了现在所称的门捷列夫定律的基础，该定律指出元素的性质是其原子量的周期函数。这意味着，当元素按原子量递增的顺序排列时，它们的化学性质会表现出反复出现的模式。理解门捷列夫定律不仅有助于我们欣赏周期表的组织方式，还提供了对不同元素之间关系的深入见解。门捷列夫于1869年首次发布了他的周期表，这在当时是革命性的。他注意到，当按原子量排序时，具有相似性质的元素会以规律的间隔出现。例如，他将钠和钾等元素归为一类，因为它们都具有相似的化学行为。这一观察使他形成了他的定律，表明元素之间存在一种潜在的秩序，可以根据它们在表中的位置预测它们的性质。门捷列夫定律的一个显著特点是，它使门捷列夫能够预测尚未发现的元素的存在和性质。例如，他在表中留出了这些未发现元素的空缺，甚至以惊人的准确性预测了它们的原子量和性质。在他发布周期表后的几年里，镓和锗的发现证实了他的预测，巩固了门捷列夫定律的有效性。门捷列夫的方法不仅仅是关于组织元素；它还涉及理解元素之间的关系。通过使用门捷列夫定律，化学家可以预测元素之间的反应方式，这对于化学的理论和实际应用至关重要。例如，知道氯和钠会反应形成食盐（氯化钠）根植于门捷列夫概述的周期性质之中。然而，值得注意的是，门捷列夫定律并不是没有局限性的。现代周期表是按原子序数而不是原子量排列的，这解决了门捷列夫遇到的一些不一致性。例如，碘和碲等元素在按原子量排列时并没有整齐地适应这一模式。这导致人们意识到原子序数是分类元素的更准确依据，因为它反映了原子核中质子的数量。尽管有这些进展，门捷列夫定律的本质仍然是相关的。它作为现代化学发展的历史基石，继续影响我们今天对化学行为的理解。周期表不仅仅是一个元素的图表；它是一个动态工具，反映了自然的基本原则，其中许多原则是门捷列夫首次阐述的。总之，门捷列夫定律代表了化学中的一个基本原理，塑造了我们对元素及其相互作用的理解。它的预测能力和周期表的组织方式为无数科学进步铺平了道路。当我们继续探索物质的复杂性时，门捷列夫的遗产提醒我们寻求自然中的模式以及化学世界中存在的深刻联系的重要性。