total mass number

简明释义

质量数

英英释义

例句

1.In nuclear chemistry, the total mass number is crucial for balancing nuclear equations.

在核化学中，总质量数对平衡核方程至关重要。

2.To find the element's identity, you need to know its total mass number along with its atomic number.

要确定元素的身份，您需要知道它的总质量数以及原子序数。

3.When calculating the total mass number, remember to add both protons and neutrons.

计算总质量数时，请记得将质子和中子都加上。

4.The atom has a total mass number of 12, which means it contains 6 protons and 6 neutrons.

这个原子的总质量数为12，这意味着它含有6个质子和6个中子。

5.The total mass number of an isotope can differ from that of the standard element.

同位素的总质量数可能与标准元素不同。

作文

The concept of the total mass number is fundamental in the field of chemistry and physics, particularly when discussing the structure of atoms. The total mass number, also known as atomic mass number, refers to the sum of protons and neutrons present in the nucleus of an atom. This number is crucial because it helps us understand the stability and behavior of different elements. For instance, when we look at the periodic table, we can see how the total mass number varies among the elements, influencing their chemical properties and reactions.Atoms are made up of three primary particles: protons, neutrons, and electrons. While electrons play a significant role in chemical bonding and reactions, it is the protons and neutrons that contribute to the total mass number. Protons carry a positive charge, while neutrons are neutral. The number of protons in an atom defines its elemental identity; for example, hydrogen has one proton, while carbon has six. However, the total mass number gives us additional information about isotopes of elements. Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons, resulting in different total mass numbers.Understanding the total mass number is essential in various applications, including nuclear medicine and radiocarbon dating. In nuclear medicine, certain isotopes are used for imaging and treatment purposes. For example, iodine-131, which has a total mass number of 131, is commonly used to treat thyroid conditions. The specific total mass number indicates the isotope's stability and the type of radiation it emits, which is critical for medical applications.Moreover, in the context of radiocarbon dating, scientists use the total mass number of carbon isotopes to determine the age of organic materials. Carbon-14, with a total mass number of 14, is a radioactive isotope that decays over time. By measuring the remaining amount of carbon-14 in a sample and knowing its total mass number, researchers can estimate the time since the organism's death, providing valuable insights into historical timelines.In summary, the total mass number is a vital concept in understanding atomic structure and the behavior of elements. It not only helps define the identity of an element but also plays a significant role in various scientific applications. As we continue to explore the complexities of matter, the total mass number will remain a key factor in our understanding of the physical world around us.

“总质量数”的概念在化学和物理学领域中是基础性的，特别是在讨论原子结构时。“总质量数”，也称为原子质量数，指的是原子核中质子和中子的总和。这个数字至关重要，因为它帮助我们理解不同元素的稳定性和行为。例如，当我们查看周期表时，可以看到“总质量数”在元素之间是如何变化的，这影响了它们的化学性质和反应。原子由三种主要粒子组成：质子、中子和电子。尽管电子在化学结合和反应中发挥着重要作用，但正是质子和中子对“总质量数”做出了贡献。质子带有正电荷，而中子是中性的。原子中质子的数量定义了其元素身份；例如，氢有一个质子，而碳有六个。然而，“总质量数”提供了关于元素同位素的额外信息。同位素是相同元素的变体，它们具有相同数量的质子，但中子数量不同，从而导致不同的“总质量数”。理解“总质量数”在各种应用中至关重要，包括核医学和放射性碳定年。在核医学中，某些同位素用于成像和治疗目的。例如，碘-131，其“总质量数”为131，常用于治疗甲状腺疾病。特定的“总质量数”指示了同位素的稳定性和它发射的辐射类型，这对于医疗应用至关重要。此外，在放射性碳定年的背景下，科学家使用碳同位素的“总质量数”来确定有机材料的年龄。碳-14，其“总质量数”为14，是一种随时间衰变的放射性同位素。通过测量样本中剩余的碳-14量并知道其“总质量数”，研究人员可以估计生物体死亡以来的时间，为历史时间线提供宝贵的见解。总之，“总质量数”是理解原子结构和元素行为的重要概念。它不仅有助于定义元素的身份，而且在各种科学应用中发挥着重要作用。随着我们继续探索物质的复杂性，“总质量数”将始终是我们理解周围物理世界的关键因素。