alkaline earth metal

简明释义

碱土族金属

英英释义

例句

1.Barium, a heavy alkaline earth metal, is used in medical imaging.

钡，一种重的碱土金属，用于医学成像。

2.Calcium, an alkaline earth metal, is essential for bone health.

钙，作为一种碱土金属，对骨骼健康至关重要。

3.The alkaline earth metals are known for their reactivity with water.

这些碱土金属以与水的反应性而闻名。

4.Strontium, an alkaline earth metal, is used in producing red fireworks.

锶，一种碱土金属，用于制造红色烟花。

5.Magnesium, another alkaline earth metal, is used in fireworks for its bright white flame.

镁，另一种碱土金属，用于烟花中以产生明亮的白色火焰。

作文

Alkaline earth metals are a group of elements found in Group 2 of the periodic table. These metals include beryllium, magnesium, calcium, strontium, barium, and radium. They are known for their distinct properties, which set them apart from other metal groups. One of the most notable characteristics of alkaline earth metals (碱土金属) is their reactivity. While they are less reactive than alkali metals, they can still react vigorously with water and acids, producing hydrogen gas and corresponding hydroxides. For instance, when calcium reacts with water, it forms calcium hydroxide and hydrogen gas, showcasing the typical behavior of alkaline earth metals (碱土金属). The physical properties of alkaline earth metals (碱土金属) are also quite fascinating. They are shiny, silvery-white metals that are relatively soft and can be cut easily with a knife. However, they become harder as you move down the group in the periodic table. Beryllium, for example, is much harder than barium. Additionally, these metals have low densities, and the first three members—beryllium, magnesium, and calcium—are less dense than water.Chemically, alkaline earth metals (碱土金属) tend to form +2 oxidation states, which means they readily lose two electrons to achieve a stable electron configuration. This property makes them highly effective in forming ionic compounds. For example, when magnesium reacts with chlorine, it forms magnesium chloride, a common compound used in various applications, including food preservation and as a de-icing agent. The ability of alkaline earth metals (碱土金属) to form strong ionic bonds is a key factor in their wide range of uses.In nature, alkaline earth metals (碱土金属) are never found in their pure elemental form due to their high reactivity. Instead, they are commonly found in various minerals. For instance, calcium is abundant in limestone, while magnesium is often found in dolomite. The extraction of these metals typically involves electrolysis or reduction processes, which can be energy-intensive but are essential for obtaining these valuable materials.The role of alkaline earth metals (碱土金属) in biological systems is also significant. Calcium, for example, is crucial for many biological functions, including muscle contraction, nerve transmission, and blood clotting. It is an essential nutrient for living organisms, particularly for bones and teeth formation. On the other hand, magnesium plays a vital role in over 300 enzymatic reactions in the body, highlighting the importance of alkaline earth metals (碱土金属) in maintaining health and well-being.In conclusion, alkaline earth metals (碱土金属) are a unique group of elements with distinct properties and significant roles in both chemistry and biology. Their reactivity, physical characteristics, and importance in various applications make them a fascinating subject of study. Understanding these metals not only enhances our knowledge of the periodic table but also sheds light on their practical implications in our daily lives.