The division of the main light metals, heavy metals and light metals of light metals

Divided according to density, heavy metals refer to densities greater than.

of metals, including gold, silver, copper, iron, mercury, lead, cadmium, etc. Light metals are those that are less than density.

The metals are divided into two categories: non-ferrous light metals and rare light metals. Non-ferrous light metals include aluminum, magnesium, calcium, titanium, potassium, strontium, barium, etc., and rare light metals include lithium, beryllium, rubidium, cesium, etc.

What are Heavy Metals?

Metals with a density above are called heavy metals. There are 60 natural metal elements with atomic numbers from 23 (v) to 92 (u), and except for 6 of them, the remaining 54 are more dense, so in the sense of density, these 54 metals are all heavy metals.

However, when it comes to elemental classification, some of them are rare earth metals and some are classified as refractory metals. In the end, 10 metal elements were actually classified as heavy metals in industry: copper, lead, zinc, tin, nickel, cobalt, antimony, mercury, cadmium and bismuth.

These 10 kinds of heavy metals have metal commonality and density greater than.

In addition, there is no other special commonality, and various heavy metals have their own properties.

What is Light Metal?

Metals with a relative density of less than 5. It is divided into two categories: non-ferrous light metals and rare light metals. Non-ferrous light metals include aluminum, magnesium, calcium, titanium, potassium, strontium, barium, etc., the first four are mostly used as reducing agents in industry, aluminum, magnesium, titanium and their alloys have a small relative density, high strength, strong corrosion resistance, and are widely used in aircraft manufacturing and aerospace and other industrial sectors.

Rare light metals include lithium, beryllium, rubidium, cesium, etc., beryllium is mainly used in the preparation of beryllium bronze, because of the small thermal neutron capture cross section of beryllium, it can also be used as a structural material for nuclear reactors. Lithium is used as a deoxidizer and degassing agent in metal smelting, and as a thermonuclear reaction material.

First, the density is different1. Light metal: metal with a relative density of less than 5.

2. Heavy metals: metals with a density above are called heavy metals.

Second, the classification is different1. Light metals: divided into two categories: non-ferrous light metals and rare light metals.

2. Heavy metals: When classifying elements, some of them belong to rare earth metals, and some are classified as refractory metals.

Third, the representative metal is different1. Light metals: non-ferrous light metals include aluminum, magnesium, calcium, titanium, potassium, strontium, barium, etc., the first four are mostly used as reducing agents in industry, aluminum, magnesium, titanium and their alloys have a relatively small density, high strength and strong corrosion resistance, and are widely used in aircraft manufacturing and aerospace and other industrial sectors.

2. Heavy metals: 10 metal elements are really classified as heavy metals in industry: copper, lead, zinc, tin, nickel, cobalt, antimony, mercury, cadmium and bismuth.

These 10 kinds of heavy metals have no special commonalities except for the metal commonality and density greater, and each heavy metal has its own properties.

What are Heavy Metals?

Heavy metals refer to metallic elements that have a higher atomic number and a higher relative atomic mass relative to other elements. Their density, hardness and melting point are relatively high, and the distribution of stool branches in nature is relatively rare.

Heavy metal pollution has become a global environmental protection and public health problem. Heavy metal pollution has considerable effects on human health, with cadmium, lead, mercury, etc. all identified as potential carcinogens in the population. In the process of production and application, heavy metal elements will be released directly or indirectly, forming a source of environmental pollution.

What is Light Metal?

Compared with heavy metals, light metals have a lower atomic number, a lower relative atomic mass, and a smaller density. They have good thermal and electrical conductivity, as well as superior mechanical properties such as hardness, toughness and plasticity.

Light metals are widely used in a variety of industrial fields. For example, alloys such as aluminum and magnesium can be made into auto parts, aircraft parts, building materials, etc. In addition, light metals are also used in electronics, aerospace and other fields.

Due to the application value of light metals, the research and development of them has always been the focus of attention.

The difference between heavy metals and light metals in the environment.

The emission of heavy metals is usually difficult to deal with and the damage to the environment is relatively large. Because they have a large atomic mass, they can cause certain harm to ecosystems in water, soil and air. In contrast, the emission of light metals is easier to deal with and controlled, and the behavior in the environment is relatively more stable.

The difference between the two in terms of their impact on human health.

Heavy metals have a great impact on human health. Some heavy metal elements such as lead, cadmium, chromium, etc., once they enter the human body, will gradually accumulate in internal organs, causing a variety of diseases. Although light metals can also cause some harm to the human body, they usually do not pose a major health risk.

How to reduce the risk of heavy metal pollution?

Heavy metal pollution in industrial processes requires emissions to be kept within safe standards. At the same time, people should reduce their exposure to heavy metal elements in their daily life, such as avoiding buying cosmetics and drugs containing heavy metals. In the daily diet, we should pay attention to a balanced diet and avoid foods containing high levels of cadmium and lead.

Epilogue. Heavy metals and light metals are two different metal elements that have distinct differences in their environmental and human impacts. By understanding the difference between the two, it is an important task closely related to environmental protection and public health to better explore the advantages of light metals and reduce the impact of heavy metal pollution on human life.

Metals are a common type of elements in nature, with good electrical conductivity, thermal conductivity, ductility and other physical properties, and are widely used in industry, construction, electronics and other fields. Based on characteristics such as density and electronic structure, metals can be classified as heavy metals and light metals.

Heavy metals generally refer to metals with greater density, such as mercury, lead, cadmium, chromium, etc. These metals are generally highly toxic and corrosive, and pose a major threat to human health and the environment. For example, mercury vapor can cause damage to the central nervous system, lead poisoning can cause symptoms such as anemia and brain damage, and cadmium contamination can easily lead to osteoporosis and liver and kidney damage.

Light metals refer to metals with less density, such as aluminum, magnesium, calcium, potassium, etc. Compared with heavy metals, these metals have low toxicity and are widely used in high-tech fields such as automobiles, aviation, and rail transit. For example, aluminum alloys have good strength and corrosion resistance, and are often used in automobiles, aircraft, and other fields.

Magnesium alloys have low weight and high strength, and are commonly used in mobile devices such as mobile phones and tablets.

Overall, the division of heavy and light metals is mainly based on their characteristics such as density and electronic structure. While light metals are relatively safe, they also need to be followed during application to ensure that their impact on humans and the environment is minimized.

1. Specific gravity (relative density).

Heavy metals: specific gravity greater than 5 (density greater than grams per cubic centimeter).

Light metals: metals with a relative density (specific gravity) of less than 5.

2. Types. Heavy metals: 10 kinds of metal elements are really classified as heavy metals in the industry

Copper, lead, zinc, tin, nickel, cobalt, antimony, mercury, cadmium, and bismuth. In terms of environmental pollution, the heavy metals mainly refer to mercury (mercury), cadmium, lead, chromium and arsenic-like heavy elements with significant biological toxicity.

Light metals: divided into non-ferrous light metals and rare light metals. Non-ferrous light metals include aluminum (Al), magnesium (mg), calcium (Ca), strontium (SR), barium (BA), potassium (K) and sodium (Na).

Rare metals beryllium, lithium, rubidium and cesium are generally classified as rare light metals. Calcium, strontium, magnesium and barium in light metals are collectively known as alkaline earth metals, and potassium and sodium are alkali metals.

3. Toxic or useful.

Heavy metals: Heavy metals are very difficult to biodegrade, but they can be enriched thousands of times under the biomagnification of the food chain and finally enter the human body. Heavy metals can interact strongly with proteins and enzymes in the human body, making them inactive, and may also accumulate in some organs of the human body, causing chronic poisoning.

Light metals: non-ferrous light metals such as aluminum, magnesium, calcium and titanium are mostly used as reducing agents in industry, and aluminum, magnesium, titanium and their alloys have small relative density, high strength and strong corrosion resistance, and are widely used in aircraft manufacturing and aerospace and other industrial sectors. The rare light metal beryllium is mainly used in the preparation of beryllium bronze, and can be used as a structural material for nuclear reactors due to its small thermal neutron capture cross-section of beryllium.

Lithium, a rare light metal, is used as a deoxidizer and degassing agent in metal smelting, and as a thermonuclear reaction material.

1 Pinyin 2 Annotations.

qīng jīn shǔ

Light metals generally refer to metals with less density, including aluminum, magnesium, sodium, potassium, calcium, strontium, and barium. According to the classification of non-ferrous metals in the metallurgical industry, the metals with a density less than the pre-foundation are not all classified as light metals, such as lithium, rubidium, cesium, and beryllium are classified as rare metals (belonging to rare light metals), and titanium is classified as refractory metals among the rare metals.

Heavy metals refer to metals with a specific gravity greater than 5, (generally referring to metals with a density greater than grams per cubic centimeter), there are about 45 kinds, such as copper, lead, zinc, iron, cobalt, nickel, manganese, cadmium, mercury, tungsten, molybdenum, gold, silver, etc. Although heavy metals such as manganese, copper, and zinc are trace elements needed for life activities, most of the heavy metals such as mercury, lead, cadmium, etc., are not necessary for life activities, and all heavy metals are toxic to the human body if they exceed a certain concentration. Although arsenic is not a heavy metal, it is usually included in the heavy metal category for research and discussion because of its ** and hazards similar to heavy metals.

The common feature of light metals is that the specific gravity is less than 5, (and there is a density of less than 4.)5 grams of cubic box meters), such as the specific gravity of aluminum is 27. The specific gravity of magnesium is 1

7 times, while the specific gravity of potassium is only, and sodium is only; Secondly, it is chemically active, and the compounds of oxygen, sulfur, carbon and halogen are very stable.