atomic mass number

简明释义

原子质量数;

英英释义

例句

1.When calculating the weight of an atom, the atomic mass number 原子质量数 is a crucial factor.

在计算原子的重量时，atomic mass number 原子质量数是一个重要因素。

2.The periodic table lists elements by their atomic mass number 原子质量数, which helps in identifying their properties.

元素周期表按其atomic mass number 原子质量数列出元素，这有助于识别它们的性质。

3.To determine the atomic mass number 原子质量数, you can simply add the number of protons to the number of neutrons.

要确定atomic mass number 原子质量数，你可以简单地将质子数与中子数相加。

4.The atomic mass number 原子质量数 of an element is the total number of protons and neutrons in its nucleus.

一个元素的atomic mass number 原子质量数是其核内质子和中子的总数。

5.In isotopes, the atomic mass number 原子质量数 varies while the number of protons remains constant.

在同位素中，atomic mass number 原子质量数变化，而质子数保持不变。

作文

The concept of the atomic mass number is fundamental in the field of chemistry and physics, as it provides essential information about the composition of an atom. The atomic mass number, defined as the total number of protons and neutrons in the nucleus of an atom, plays a crucial role in determining the stability and behavior of elements. To grasp the significance of the atomic mass number, it is important to first understand the basic structure of an atom. An atom consists of a nucleus, which contains protons and neutrons, surrounded by electrons that orbit around the nucleus. Protons carry a positive charge, while neutrons are neutral, and electrons have a negative charge. The number of protons in an atom defines its atomic number, which identifies the element itself. For instance, hydrogen has one proton and an atomic mass number of 1, while carbon has six protons and an atomic mass number of 12.The atomic mass number is not just a numerical value; it has practical implications in various scientific applications. For example, when scientists study isotopes, they focus on atoms of the same element that have different atomic mass numbers. Isotopes can have varying numbers of neutrons, which leads to differences in their stability and radioactive properties. This understanding is critical in fields such as medicine, where radioactive isotopes are used for diagnostic imaging and cancer treatment.Moreover, the atomic mass number influences the chemical behavior of elements. Elements with similar atomic mass numbers often exhibit similar chemical properties. This is evident in the periodic table, where elements are arranged according to their atomic mass numbers and atomic numbers. The periodic trends observed in the table, such as electronegativity and ionization energy, are closely related to the atomic mass number and the arrangement of electrons in an atom.In addition to its significance in chemistry, the atomic mass number is essential in understanding nuclear reactions. During nuclear fission and fusion, the atomic mass number helps predict the products of these reactions. For instance, in nuclear power plants, uranium-235, which has an atomic mass number of 235, undergoes fission to release energy. Understanding the atomic mass number allows scientists to calculate energy outputs and manage fuel resources effectively.In conclusion, the atomic mass number is a vital concept that underpins many aspects of science, from the structure of matter to the behavior of elements and the principles of nuclear reactions. By comprehensively understanding the atomic mass number, students and professionals in the fields of chemistry and physics can better appreciate the complexities of the natural world. As we continue to explore the universe at both the atomic and molecular levels, the atomic mass number will remain a key element in our quest for knowledge, driving advancements in technology, medicine, and environmental science.

原子质量数的概念在化学和物理学领域中是基础性的，因为它提供了关于原子组成的重要信息。原子质量数被定义为原子核中质子和中子的总数，它在决定元素的稳定性和行为方面发挥着关键作用。为了理解原子质量数的重要性，首先需要了解原子的基本结构。原子由一个核组成，核内含有质子和中子，周围环绕着电子。质子带有正电荷，而中子是中性的，电子则带有负电荷。原子中的质子数量定义了其原子序数，从而标识出元素本身。例如，氢的质子数为1，原子质量数为1，而碳的质子数为6，原子质量数为12。原子质量数不仅仅是一个数字，它在各种科学应用中具有实际意义。例如，当科学家研究同位素时，他们关注的是具有不同原子质量数的同一元素的原子。同位素可以有不同数量的中子，这导致它们的稳定性和放射性特性存在差异。这种理解在医学等领域至关重要，放射性同位素被用于诊断成像和癌症治疗。此外，原子质量数影响元素的化学行为。具有相似原子质量数的元素往往表现出相似的化学性质。这在周期表中显而易见，元素根据其原子质量数和原子序数排列。周期表中观察到的周期趋势，如电负性和电离能，与原子质量数和原子中电子的排列密切相关。除了在化学中的重要性外，原子质量数在理解核反应中也是必不可少的。在核裂变和核聚变过程中，原子质量数有助于预测这些反应的产物。例如，在核电站，铀-235（原子质量数为235）发生裂变以释放能量。理解原子质量数使科学家能够计算能量输出并有效管理燃料资源。总之，原子质量数是一个重要的概念，它支撑着科学的许多方面，从物质的结构到元素的行为以及核反应的原理。通过全面理解原子质量数，化学和物理领域的学生和专业人士可以更好地欣赏自然界的复杂性。随着我们继续在原子和分子层面探索宇宙，原子质量数将继续成为我们知识追求中的关键元素，推动技术、医学和环境科学的发展。