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匿名 發問於 科學及數學化學 · 1 十年前

我想問鎂(Magnesium)係點樣比人發現??

我想問鎂(Magnesium)係點樣比人發現??

我知係一個叫Joseph Black既人係1755發現,咁佢係點發現到Magnesium???

MAIN最緊要--唔該用英文回答,, USE ENGLISH PLZ~~~

AND一定要--同埋唔該一定一定要寫你既資料來源(REFERENCES),, 我要寫低,,,

快,, 我最遲聽日要LA!!!! 我要交HW~~

THXTHXTHX~~~ 無限感激!!

更新:

仲有想問下... 鎂在現時社會、日常生活會點用到?

ENGLISH+REFERENCES

THXXX~

3 個解答

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  • 1 十年前
    最愛解答

    Introduction(簡介)

    Magnesium is the chemical element in the periodic table that has the symbol Mg and atomic number 12 and an atomic mass of 24.31. Magnesium is the eighth most abundant element and constitutes about 2% of the Earth's crust by weight, and it is the third most plentiful element dissolved in seawater. Magnesium ion is essential to all living cells. The free element (metal) is not found in nature. Once produced from magnesium salts, this alkaline earth metal is primarily used as an alloying agent to make aluminium-magnesium alloys, sometimes called magnalium or magnelium.

    History(歷史)

    The name originates from the Greek word for a district in Thessaly called Magnesia. Joseph Black in Scotland recognized magnesium as being an element in 1755, Sir Humphry Davy electrolytically isolated pure magnesium metal in 1808 from a mix of magnesia and HgO, and A. A. B. Bussy prepared it in coherent form in 1831. Magnesium is the eighth most abundant element in the earth's crust. It is an alkaline earth metal and therefore does not occur uncombined with other elements. It is found in large deposits of magnesite, dolomite, and other minerals.

    Applications(用處)

    1. As the metal

    Magnesium is the third most commonly used structural metal, following steel and aluminium.

    Magnesium compounds, primarily magnesium oxide, are used mainly as refractory material in furnace linings for producing iron, steel, nonferrous metals, glass and cement. Magnesium oxide and other compounds also are used in agricultural, chemical and construction industries. As a metal, this element's principal use is as an alloying additive to aluminium with these aluminium-magnesium alloys being used mainly for beverage cans.

    2. Food sources

    Magnesium, in its purest form, can be compared to aluminium, and is strong and light, so it is used in several high volume part manufacturing applications, including automotive and truck components. Specialty, high-grade car wheels of magnesium alloy are called mag wheels.

    Green vegetables such as spinach provide magnesium because the center of the chlorophyll molecule contains magnesium. Nuts (especially almonds), seeds, and some whole grains are also good sources of magnesium.

    3. In magnesium compound

    Magnesium's hydroxide is used in milk of magnesia, its chloride and citrate used as oral magnesium supplements, and its sulfate (Epsom salts) for various purposes in medicine, and elsewhere.

    Dead-burned magnesite is used for refractory purposes such as brick and liners in furnaces and converters.

    Magnesium carbonate (MgCO3) powder is also used by athletes, such as gymnasts and weightlifters, to improve the grip on objects – the apparatus or lifting bar.

    The magnesium ion is necessary for all life (see magnesium in biological systems), so magnesium salts are an additive for foods, fertilizers (Mg is a component of chlorophyll), and culture media.

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  • 1 十年前

    好d英文字唔明

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  • 1 十年前

    1808年,英國化學家戴維(H.Davy)用熔融電解法首先制得了金屬鎂。1828年法國科學家比西用金屬鉀還原熔融的無水氯化鎂得到純鎂。

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