atomic weight

简明释义

原子量

英英释义

例句

1.When calculating the molar mass of a compound, you must consider the atomic weight of each element involved.

在计算化合物的摩尔质量时，必须考虑每个元素的原子量。

2.The periodic table lists the atomic weight of each element, making it easier for chemists to reference.

元素周期表列出了每个元素的原子量，这使得化学家更容易查阅。

3.The atomic weight of carbon is approximately 12.01, which means it has a 原子量 close to this value.

碳的原子量大约为12.01，这意味着它的atomic weight接近这个值。

4.In chemistry, the atomic weight is essential for converting grams to moles.

在化学中，原子量对于将克转换为摩尔是必不可少的。

5.Different isotopes of an element can have different atomic weights due to variations in neutron count.

同位素的不同会导致元素具有不同的原子量，这是因为中子数的变化。

作文

The concept of atomic weight is fundamental in the field of chemistry and plays a critical role in understanding the properties of elements. Atomic weight, defined as the weighted average mass of an atom's isotopes, is crucial for various applications, including stoichiometry, chemical reactions, and the formation of compounds. This measurement provides insight into how elements interact with one another and helps predict the behavior of substances under different conditions.To grasp the significance of atomic weight, it is essential to first understand the structure of an atom. Atoms consist of protons, neutrons, and electrons, with protons and neutrons located in the nucleus. The number of protons determines the atomic number of an element, while the total number of protons and neutrons gives us the atomic mass. However, because elements can exist in different isotopic forms—atoms with the same number of protons but varying numbers of neutrons—the atomic weight reflects the average of these isotopes based on their natural abundance.For instance, consider the element carbon. Carbon has two stable isotopes: carbon-12 and carbon-13. The majority of carbon found in nature is carbon-12, which has an atomic weight of approximately 12 atomic mass units (amu). In contrast, carbon-13 has an atomic weight of about 13 amu. Because carbon-12 is more prevalent, the atomic weight of carbon is calculated to be around 12.01 amu, taking into account the relative abundances of both isotopes. This value is crucial for chemists when calculating molar masses and determining the proportions of elements in chemical reactions.Understanding atomic weight also aids in the application of the periodic table. Each element listed in the periodic table has its own atomic weight, which is vital for predicting how elements will combine. For instance, when balancing chemical equations, knowing the atomic weight allows chemists to convert between grams and moles, facilitating the calculation of reactants and products in a reaction.Moreover, atomic weight is not just a theoretical concept; it has practical implications in various scientific fields, including medicine, environmental science, and materials science. For example, in medicine, understanding the atomic weight of elements is crucial for drug formulation and dosage calculations. In environmental science, it helps in analyzing pollutants and their interactions in ecosystems.In conclusion, the concept of atomic weight is indispensable in chemistry and beyond. Its definition as the weighted average mass of an atom's isotopes underscores the complexity and diversity of elements. By mastering the concept of atomic weight, students and professionals alike can enhance their understanding of chemical principles and apply this knowledge to real-world situations. Whether in the laboratory or the classroom, the importance of atomic weight cannot be overstated, as it serves as a cornerstone for various scientific endeavors and innovations.

原子量的概念在化学领域中是基础性的，并且在理解元素特性方面起着关键作用。原子量被定义为一个原子同位素的加权平均质量，它对各种应用至关重要，包括化学计量、化学反应和化合物的形成。这一测量提供了对元素如何相互作用的深入见解，并帮助预测物质在不同条件下的行为。要理解原子量的重要性，首先必须了解原子的结构。原子由质子、中子和电子组成，其中质子和中子位于原子核中。质子的数量决定了元素的原子序数，而质子和中子的总数则给出了原子质量。然而，由于元素可以以不同的同位素形式存在——质子数相同但中子数不同的原子——因此原子量反映了这些同位素的自然丰度加权平均。例如，考虑元素碳。碳有两种稳定的同位素：碳-12和碳-13。大多数自然界中的碳是碳-12，其原子量约为12个原子质量单位（amu）。相比之下，碳-13的原子量约为13个amu。由于碳-12更为普遍，因此碳的原子量计算为约12.01 amu，这一数值考虑了两种同位素的相对丰度。这一数值对于化学家在计算摩尔质量和确定化学反应中元素的比例时至关重要。理解原子量还有助于周期表的应用。周期表中列出的每个元素都有其自身的原子量，这对于预测元素的结合方式至关重要。例如，在平衡化学方程式时，知道原子量使化学家能够在克与摩尔之间进行转换，从而便于计算反应中的反应物和产物。此外，原子量不仅是一个理论概念；它在医学、环境科学和材料科学等各个科学领域都有实际意义。例如，在医学中，了解元素的原子量对于药物配方和剂量计算至关重要。在环境科学中，它有助于分析污染物及其在生态系统中的相互作用。总之，原子量的概念在化学及其他领域中不可或缺。作为一个原子同位素的加权平均质量的定义突显了元素的复杂性和多样性。通过掌握原子量的概念，学生和专业人士可以增强对化学原理的理解，并将这一知识应用于现实世界的情况中。无论是在实验室还是在课堂上，原子量的重要性都不容小觑，因为它为各种科学努力和创新奠定了基础。