atomic mass

简明释义

原子质量

英英释义

例句

1.The atomic mass of oxygen is about 16.00 u, which is crucial for understanding water's properties.

氧的原子质量约为16.00 u，这对于理解水的性质至关重要。

2.The atomic mass of carbon is approximately 12.01 u.

碳的原子质量约为12.01 u。

3.In the periodic table, the atomic mass is usually listed below the element symbol.

在周期表中，原子质量通常列在元素符号下方。

4.Different isotopes of an element can have different atomic mass values.

同位素的原子质量值可以不同。

5.To calculate the molecular weight, you need to sum up the atomic mass of each element in the compound.

要计算分子量，您需要将化合物中每种元素的原子质量相加。

作文

The concept of atomic mass is fundamental in the field of chemistry and physics. It refers to the mass of an atom, typically expressed in atomic mass units (amu). Understanding atomic mass is crucial for various scientific calculations, including determining the composition of compounds and understanding the behavior of elements in reactions. To grasp the significance of atomic mass, one must first understand that atoms are composed of protons, neutrons, and electrons. The protons and neutrons reside in the nucleus of the atom, while the electrons orbit around this nucleus. The mass of an atom is primarily determined by the number of protons and neutrons it contains, as electrons have a negligible mass compared to these subatomic particles. Therefore, the atomic mass of an element is essentially the sum of the masses of its protons and neutrons.For example, consider the element carbon, which has an atomic number of 6. This means that a carbon atom has 6 protons. In its most common isotope, carbon-12, there are also 6 neutrons. Thus, the atomic mass of carbon-12 is approximately 12 amu. However, not all carbon atoms are the same. There are isotopes like carbon-13 and carbon-14, which have different numbers of neutrons, leading to different atomic masses. Carbon-13 has 7 neutrons, giving it an atomic mass of about 13 amu, while carbon-14, with 8 neutrons, has an atomic mass of approximately 14 amu.The concept of atomic mass becomes even more interesting when we consider the periodic table of elements. Each element is listed with its atomic mass, which is often a weighted average of the masses of its naturally occurring isotopes. For instance, the atomic mass of chlorine is approximately 35.5 amu, reflecting the abundance of its isotopes, chlorine-35 and chlorine-37. Understanding atomic mass is not only essential for chemists but also for various applications in fields such as medicine, environmental science, and materials engineering. For instance, in nuclear medicine, the atomic mass of isotopes is critical for understanding how they behave in the body and how they can be used for diagnostic imaging or treatment. Similarly, in environmental science, knowing the atomic mass of pollutants can help in assessing their impact on ecosystems and human health.In conclusion, the term atomic mass encompasses a vital aspect of atomic theory and chemical understanding. It allows scientists to quantify and predict the behavior of elements and compounds, facilitating advancements in numerous scientific disciplines. By mastering the concept of atomic mass, one gains a deeper appreciation for the building blocks of matter and the intricate interactions that govern the natural world. A solid grasp of atomic mass not only enhances our understanding of chemistry but also empowers us to apply this knowledge in practical and innovative ways.

“原子质量”这一概念在化学和物理学领域中是基础性的。它指的是原子的质量，通常以原子质量单位（amu）表示。理解“原子质量”对于各种科学计算至关重要，包括确定化合物的组成和理解元素在反应中的行为。要掌握“原子质量”的重要性，首先必须了解原子是由质子、中子和电子组成的。质子和中子位于原子的核内，而电子则围绕这个核旋转。原子的质量主要由其所含的质子和中子的数量决定，因为与这些亚原子粒子相比，电子的质量可以忽略不计。因此，元素的“原子质量”基本上是其质子和中子质量的总和。例如，考虑元素碳，其原子序数为6。这意味着一个碳原子有6个质子。在其最常见的同位素碳-12中，还有6个中子。因此，碳-12的“原子质量”约为12 amu。然而，并非所有的碳原子都是相同的。还有同位素如碳-13和碳-14，它们具有不同数量的中子，从而导致不同的“原子质量”。碳-13有7个中子，其“原子质量”约为13 amu，而碳-14则有8个中子，其“原子质量”约为14 amu。当我们考虑元素周期表时，“原子质量”的概念变得更加有趣。每个元素都列出了其“原子质量”，这通常是其自然存在的同位素质量的加权平均。例如，氯的“原子质量”约为35.5 amu，反映了其同位素氯-35和氯-37的丰度。理解“原子质量”不仅对化学家至关重要，还对医学、环境科学和材料工程等领域的各种应用至关重要。例如，在核医学中，同位素的“原子质量”对于理解它们在体内的行为以及如何用于诊断成像或治疗至关重要。同样，在环境科学中，了解污染物的“原子质量”可以帮助评估其对生态系统和人类健康的影响。总之，“原子质量”这一术语涵盖了原子理论和化学理解的重要方面。它使科学家能够量化和预测元素和化合物的行为，从而推动多个科学学科的进步。通过掌握“原子质量”这一概念，人们可以更深入地欣赏物质的基本构成和支配自然界的复杂相互作用。扎实掌握“原子质量”不仅增强了我们对化学的理解，还使我们能够以实际和创新的方式应用这些知识。