Magnesium Atomic Number

The Element Magnesium

To understand this concept, we must know the basic terminologies such as atomic number and mass number of an atom along with its subatomic particles namely proton, electron, and neutron. Atomic number (Z): is defined as the number of protons in a. For the element of MAGNESIUM, you already know that the atomic number tells you the number of electrons. That means there are 12 electrons in a magnesium atom. Looking at the picture, you can see there are two electrons in shell one, eight in shell two, and two more in shell three. ► More about the history and places to find magnesium.

[Click for Isotope Data]

Atomic Number: 12

Atomic Weight: 24.305

Melting Point: 923 K (650°C or 1202°F)

Boiling Point: 1363 K (1090°C or 1994°F)

Beneath this mask pdf free download. (SLNSW Infocus item 0538).

Density: 1.74 grams per cubic centimeter

Phase at Room Temperature: Solid

Element Classification: Metal

Period Number: 3

Group Number: 2

Group Name: Alkaline Earth Metal

What's in a name? For Magnesia, a district in the region of Thessaly, Greece.

Say what? Magnesium is pronounced as mag-NEE-zhi-em.

History and Uses:

Although it is the eighth most abundant element in the universe and the seventh most abundant element in the earth's crust, magnesium is never found free in nature. Magnesium was first isolated by Sir Humphry Davy, an English chemist, through the electrolysis of a mixture of magnesium oxide (MgO) and mercuric oxide (HgO) in 1808. Today, magnesium can be extracted from the minerals dolomite (CaCO3·MgCO3) and carnallite (KCl·MgCl2·6H2O), but is most often obtained from seawater. Every cubic kilometer of seawater contains about 1.3 billion kilograms of magnesium (12 billion pounds per cubic mile).

Magnesium Atomic Number And Symbol

Magnesium burns with a brilliant white light and is used in pyrotechnics, flares and photographic flashbulbs. Magnesium is the lightest metal that can be used to build things, although its use as a structural material is limited since it burns at relatively low temperatures. Magnesium is frequently alloyed with aluminum, which makes aluminum easier to roll, extrude and weld. Magnesium-aluminum alloys are used where strong, lightweight materials are required, such as in airplanes, missiles and rockets. Cameras, horseshoes, baseball catchers' masks and snowshoes are other items that are made from magnesium alloys.

Magnesium oxide (MgO), also known as magnesia, is the second most abundant compound in the earth's crust. Magnesium oxide is used in some antacids, in making crucibles and insulating materials, in refining some metals from their ores and in some types of cements. When combined with water (H2O), magnesia forms magnesium hydroxide (Mg(OH)2), better known as milk of magnesia, which is commonly used as an antacid and as a laxative.

Hydrated magnesium sulphate (MgSO4·7H2O), better known as Epsom salt, was discovered in 1618 by a farmer in Epsom, England, when his cows refused to drink the water from a certain mineral well. He tasted the water and found that it tasted very bitter. He also noticed that it helped heal scratches and rashes on his skin. Epsom salt is still used today to treat minor skin abrasions.

Other magnesium compounds include magnesium carbonate (MgCO3) and magnesium fluoride (MgF2). Magnesium carbonate is used to make some types of paints and inks and is added to table salt to prevent caking. A thin film of magnesium fluoride is applied to optical lenses to help reduce glare and reflections.

Estimated Crustal Abundance: 2.33×104 milligrams per kilogram

Estimated Oceanic Abundance: 1.29×103 milligrams per liter

Number of Stable Isotopes: 3 (View all isotope data)

Ionization Energy: 7.646 eV

Oxidation States: +2

Electron Shell Configuration:


2s2 2p6


For questions about this page, please contact Steve Gagnon.

Atomic Number of Magnesium is 12.

Chemical symbol for Magnesium is Mg. Number of protons in Magnesium is 12. Atomic weight of Magnesium is 24.305 u or g/mol. Melting point of Magnesium is 648,8 °C and its the boiling point is 1107 °C.

» Boiling Point» Melting Point» Abundant» State at STP» Discovery Year

About Magnesium

Magnesium is a soft metal of light grey color, which can easily burn with bright fire. Magnesium is an essential element for all living things on our planet since a molecule of magnesium is in every cell of chlorophyll, which is the material for photosynthesis. In human body, magnesium is a compound of various enzymes necessary for correct and smooth chemical reactions in our body tissues. Since magnesium is very highly reactive, it can’t be found freely in nature, but it can be obtained from a number of natural sources, manly such minerals as dolomites, magnesites, etc. It is the 8th most abundant element on our planet. It has a variety of uses, primarily as a light but relatively strong metal, especially valuable for producing various consumers’ goods like suitcases, chairs, laptops, etc. Magnesium and its compounds are used to produce fireworks, as well as in medicine (especially for producing spasms reducing medicines, as laxatives, etc.).

Uses of Magnesium

Magnesium (Mg) is the most commonly used structural metal after iron and aluminum. It is especially used in the production of steel and iron to remove sulfur as well as one of the most important construction metals in aircraft and automotive industry. Magnesium is widely used in making mobile phones, cameras, televisions, tablet computers, and laptops.

Its compounds are mostly used in construction, electronics, medicine, and sports. For example, Magnesium chloride, the chemical compound with the formula MgCl2 is used for dust control and ice control. This compound is also used in nutraceutical and pharmaceutical preparations too. It is preferred in the preparation of tofu from soy milk as a coagulant. Magnesium sulfite is used in the producing of paper. Besides, magnesium alloys are very important in the airplane and car construction.

There are some other usages of magnesium as a reducing agent and an additive agent in various industries.

Magnesium is also very important for our body. It helps to convert food into energy, repair DNA and RNA, plays an important role in brain functions, and helps to prevent migraine headaches.

Compounds with Magnesium

  • MgCl2: Magnesium chloride
  • MgO: Magnesium oxide
  • Mg(OH)2: Magnesium hydroxide
  • MgSO4: Magnesium sulfate
  • MgCO3: Magnesium carbonate
  • MgSO3: Magnesium sulfite
  • F6MgSi: Magnesium hexafluorosilicate
  • MgB2: Magnesium diboride
  • MgBr2: Magnesium bromide
  • MgC2O4: Magnesium oxalate
  • MgF2: Magnesium fluoride

Properties of Magnesium Element

Atomic Number (Z)12
Atomic SymbolMg
Atomic Weight24.305 u
Density1.738 g/cm3
Melting Point (K)923 K
Melting Point (℃)648,8 °C
Boiling Point (K)1363 K
Boiling Point (℃)1107 °C
Heat Capacity1.023 J/g · K
Abundance23300 mg/kg
State at STPSolid
DescriptionAlkaline earth metal
Electronegativity (Pauling) χ1.31
Ionization Energy (eV)7.64624
Atomic Radius150pm
Covalent Radius130pm
Van der Waals Radius173
Valence Electrons2
Year of Discovery1755

Magnesium Atomic Numbers

What is the Boiling Point of Magnesium?

Magnesium boiling point is 1107 °C. Boiling point of Magnesium in Kelvin is 1363 K.

What is the Melting Point of Magnesium?

Magnesium melting point is 648,8 °C. Melting point of Magnesium in Kelvin is 923 K.

How Abundant is Magnesium?

Abundant value of Magnesium is 23300 mg/kg.

What is the State of Magnesium at Standard Temperature and Pressure (STP)?

State of Magnesium is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.

When was Magnesium Discovered?

Magnesium was discovered in 1755.

Molecular Weight Of Magnesium

Comments are closed.