alkali earth metal

简明释义

碱土金属;

英英释义

例句

1.In chemistry labs, we often use alkali earth metals (碱土金属) to demonstrate reactions with water.

在化学实验室中，我们经常使用alkali earth metals（碱土金属）来演示与水的反应。

2.The group of elements known as alkali earth metals (碱土金属) includes magnesium and calcium.

被称为alkali earth metals（碱土金属）的一组元素包括镁和钙。

3.The reactivity of alkali earth metals (碱土金属) increases as you move down the group in the periodic table.

随着在周期表中向下移动，alkali earth metals（碱土金属）的反应性增强。

4.Barium, a member of the alkali earth metals (碱土金属), is used in medical imaging.

钡，作为alkali earth metals（碱土金属）的一员，被用于医学成像。

5.Calcium, an alkali earth metal (碱土金属), is essential for bone health.

钙，一种alkali earth metal（碱土金属），对骨骼健康至关重要。

作文

The term alkali earth metal refers to a group of elements in the periodic table, specifically found in Group 2. These metals include beryllium, magnesium, calcium, strontium, barium, and radium. They are known for being highly reactive, particularly with water, and they tend to form alkaline hydroxides when they react. This is where the name alkali earth metal comes from, as 'alkali' refers to their basic nature when combined with water, and 'earth' refers to their occurrence in natural mineral deposits.One of the most interesting characteristics of alkali earth metals is their reactivity. For instance, when magnesium is exposed to water, it reacts to form magnesium hydroxide and hydrogen gas. This reaction can be quite vigorous, especially if the water is hot. Calcium, on the other hand, reacts even more readily with water, producing calcium hydroxide and hydrogen gas, which can be observed as bubbles forming in the water. This high level of reactivity is a defining feature of alkali earth metals and is attributed to their electronic configuration; they have two electrons in their outer shell, which they readily lose to achieve a stable electron configuration.In addition to their reactivity, alkali earth metals also exhibit unique physical properties. For example, they are generally shiny and silvery-white in appearance. They are also less dense than most metals, with lithium being the least dense solid element. Beryllium is an exception, as it is much harder and has a much higher melting point compared to its fellow group members. The low density and high reactivity of alkali earth metals make them useful in various applications, including fireworks, batteries, and alloys.Moreover, alkali earth metals play significant roles in biological systems. Calcium, for example, is essential for living organisms, as it plays a crucial role in bone formation and cellular processes. Magnesium is another vital element that is involved in over 300 biochemical reactions in the human body, including energy production and protein synthesis. The importance of these elements in biological systems highlights the significance of understanding alkali earth metals beyond just their chemical properties.Research into alkali earth metals continues to reveal new insights and applications. For instance, scientists are exploring the use of magnesium alloys in the automotive industry due to their lightweight properties, which can lead to more fuel-efficient vehicles. Additionally, advancements in battery technology often involve alkali earth metals, particularly lithium, which is critical for rechargeable batteries used in electric vehicles and portable electronics.In conclusion, the group of elements known as alkali earth metals encompasses a fascinating array of properties and applications. Their reactivity, physical characteristics, and biological significance make them essential to both science and industry. As research progresses, our understanding of alkali earth metals will undoubtedly expand, leading to new innovations and discoveries that could benefit various fields, from medicine to engineering.

术语碱土金属指的是周期表中的一组元素，具体位于第二组。这些金属包括铍、镁、钙、锶、钡和镭。它们以高度反应性而闻名，特别是与水的反应，当它们反应时，往往形成碱性氢氧化物。这就是碱土金属这个名称的来源，因为“碱”指的是它们与水结合时的碱性特征，而“土”则指它们在自然矿物沉积中的出现。碱土金属最有趣的特征之一是它们的反应性。例如，当镁暴露在水中时，它会反应生成氢氧化镁和氢气。这种反应可能相当剧烈，尤其是在水热时。另一方面，钙与水的反应更加迅速，产生氢氧化钙和氢气，水中可以观察到气泡的形成。这种高反应性是碱土金属的一个决定性特征，其原因在于它们的电子构型；它们的外层有两个电子，这些电子很容易失去，以达到稳定的电子构型。除了反应性，碱土金属还表现出独特的物理特性。例如，它们通常具有光亮的银白色外观。它们的密度也低于大多数金属，锂是密度最低的固体元素。铍是一个例外，因为它比同组的其他金属更硬，熔点也更高。碱土金属的低密度和高反应性使它们在烟花、电池和合金等各种应用中非常有用。此外，碱土金属在生物系统中也发挥着重要作用。例如，钙对生物体至关重要，因为它在骨骼形成和细胞过程中起着关键作用。镁是另一个重要元素，参与人体内超过300种生化反应，包括能量生产和蛋白质合成。这些元素在生物系统中的重要性突显了理解碱土金属的重要性，不仅仅限于其化学性质。对碱土金属的研究仍在继续揭示新的见解和应用。例如，科学家正在探索镁合金在汽车工业中的使用，因为其轻便的特性可以提高燃油效率。此外，电池技术的进步往往涉及碱土金属，特别是锂，这对电动汽车和便携式电子设备中使用的可充电电池至关重要。总之，被称为碱土金属的元素组涵盖了一系列迷人的特性和应用。它们的反应性、物理特征和生物重要性使它们在科学和工业中至关重要。随着研究的进展，我们对碱土金属的理解无疑将不断扩展，带来新创新和发现，可能惠及医学、工程等多个领域。