How many valence electrons does Magnesium have?

What is the valency of magnesium(Mg) Valence electrons

Magnesium (Mg) is the 12 th elements in the periodic table. Magnesium, an alkaline earth metal, has the symbol “Mg”. Magnesium is involved in the formation bonds by valence electrons. This element is created in large, old stars by the sequential additions of three Helium nuclei and a Carbon nucleus. These stars explode as supernovas. A lot of magnesium is released into the interstellar media, where it can be recycled into new star systems. Its compound is widely used in construction and medical. Magnesium is an essential element for all cellular living. Magnesium, which is eighth in the Earth’s crust, and fourth in the Earth’s total mass, makes up 13% of the Earth’s mantle.

Magnesium element


Magnesium is not found in nature, despite being the eighth most common element in the universe. Sir Humphry Davy (an English chemist) was the first to isolate magnesium from a mixture of magnesium oxide and mercuric dioxide (HgO). This was done in 1808.


Magnesium has a density that is one-third lower than that of aluminium. When used as an alloying agent, it improves the mechanical and fabrication characteristics of aluminium. These alloys can be used in car and aeroplane construction. Grignard Reagents are magnesium compounds made from organic magnesium that are essential for the chemical industry. Magnesium can be used in lightweight products such as laptops, bags, and power tools. Magnesium can also be added to steel and molten iron to remove sulfur.

Magnesium sulfurate can be used to dye fabrics. To make plastics fire-resistant, magnesium hydroxide can be added. Magnesium oxide can be used to make heat-resistant bricks that are suitable for furnaces and fireplaces. It can also be added to cattle feed or fertilisers. Medicine uses magnesium hydroxide (milk from magnesia), magnesium sulfate, chloride, and citrate. Magnesium is used to make fireworks, sparklers and flares because it ignites  in air easily.

Position of Magnesium in the periodic table

Position of Magnesium in the periodic table

Biological role

Both plant and animal life require magnesium. Photosynthesis is enabled by chlororophyll, which is a chemical that helps plants absorb sunlight. Chlorophyll, a magnesium-centred porphyrin compound, is also known as Magnesium. Without magnesium photosynthesis, life would not be possible.

Magnesium is vital for the functioning of many enzymes in humans. Each day, the average human consumes between 250-350 mgs of magnesium. Each person stores around 20 grams of magnesium in their bodies, mostly in the bones.


An electrochemical process is required to extract magnesium from magnesite and dolomite ores. First, the dolomite must be crushed and then mixed with seawater. When the mixture is heated, insoluble magnesium hydroxide separates from the seawater and sinks to its bottom. The resulting magnesium chloride is formed by filtering the mixture and adding hydrochloric acid. The new compound is then dried and electrolyzed to release the magnesium.


A magnesium ribbon strip is able to produce an very bright white light. It also leaves behind a white powder that is mostly made of magnesium dioxide, and MgO.

Magnesium’s environmental effects

We don’t know much about the effects of magnesium oxide fume on the environment. Other mammals may experience similar effects if they inhale magnesium oxide fume.

On an environment spectrum of 0-3 Magnesium oxide fume registers at 0.8. A score of 3 indicates a high environmental hazard and 0 indicates a low risk. This ranking is based on several factors. These include whether the material is toxic or poisonous and/or its inability to remain active in the surrounding environment. It also considers whether the material accumulates in living organisms.

atomic number12
atomic weight24.305
boiling point1,090 °C (1,994 °F)
melting point650 °C (1,202 °F)
specific gravity1.74 at 20° C (68 °F)
oxidation state+2
electron configuration1s22s22p63s2

Natural abundance

Magnesium, the eighth most abundant element in Earth’s crust is also found in large quantities in natural materials. Magnesium is found in large quantities in minerals like magnesite or dolomite. Magnesium is found in the sea, which contains trillions upon trillions of tonnes. This is where most of the 850,000 tonnes produced annually. It can be prepared by either reducing magnesium oxide and silicon or electrolysis of molten magnesia chloride.

Magnesium has health benefits

Magnesium intake by humans is between 250-350 mg per day and we need at least 200m. However, the body manages this element very well, taking it from food when possible and then recycling what it doesn’t have. Although there is no evidence to support the idea that magnesium causes systemic poisoning, excessive intake of magnesium supplements and medications can cause muscle weakness, lethargy, and confusion.

What are the valence electrons for magnesium (Mg)?

Magnesium (Mg) is the second element in group-2. Alkaline earth metals are all elements in group-2. Magnesium is therefore an alkaline metal. The valence electron refers to the number of electrons within the shell’s last orbit. The valence electrons for magnesium (Mg) are the total number of electrons found in the shell that remains after the electron configuration. The properties of an element are determined by the valence electrons. They also participate in the formation bonds. The electron configuration for magnesium shows that the final shell (orbit) has two electrons. This site has an article that explains the configuration of magnesium. You can read it if necessary.

What are the valence electrons of magnesium(Mg)

What number of electrons, protons, and neutrons does the magnesium (Mg) atom contain?

The nucleus can be found in the middle of an atom. The nucleus is home to protons and neutrons. Magnesium (Mg) has an atomic number 12. The number of protons is called the atomic number. The number of protons found in magnesium is twelve. The nucleus contains an electron shell that is equal to the protons. A magnesium atom can have a total number of twelve electrons.

The difference between the number atomic masses and the number atoms is what determines the number neutrons within an element. This means that neutron number (n) = atomic mass (A) + atomic number (Z).

We know that the atomic numbers of magnesium are 12 and 24 respectively. The atomic mass number for magnesium is approximately 24 (24.305). Neutron (n) = 24 – 12 = 12. The number of neutrons found in magnesium (Mg) is therefore 12.

Valence is the ability of an atom of a chemical element to form a certain number of chemical bonds with other atoms. It takes values from 1 to 8 and cannot be equal to 0. It is determined by the number of electrons of an atom spent to form chemical bonds with another atom. The valence is a real value. Numerical values of valence are indicated with roman numerals (I,II, III, IV, V, VI, VII, VIII).

How can you determine the number of valence elements in a magnesium (Mg) atom?

These are the steps to determine the valence electron. One of these is the electron configuration. Without an electron configuration, it is impossible to determine the valence of any element. It is easy to determine the valence of any element by knowing the electron configuration. This article contains details about the electron configuration. You can find it here. This article focuses on electron configuration.

However, it is possible to identify valence electrons by placing electrons according the Bohr principle. We will now learn how to identify the valence electron for magnesium (Mg).

Calculating the number of electrons present in magnesium (Mg)

First, we must know how many electrons are in magnesium (Mg) atom. You need to know how many protons are in magnesium to determine the number electrons. To know the number protons in magnesium, you must also know its atomic number.

A periodic table is required to determine the atomic number. The periodic table contains the atomic numbers of magnesium elements. The number of protons is called the atomic number. The nucleus also contains electrons that are equal to protons.

This means that we can now say that the number of electrons in the magnesium atom is equal to its atomic number. The atomic number for magnesium is 12 according to the periodic table. This means that a magnesium (Mg) atom contains 12 electrons.

The terms “oxidation degree” and “valence” may not be the same, but they are numerically almost identical. The conditional charge of an atom’s atom is called the oxidation state. It can be either positive or negative. Valence refers to the ability of an atom form bonds. It cannot have a negative value.

Magnesium(Mg) needs to be electron-configured

Important step 2 This step involves the arrangement of magnesium’s electrons. We know that the total number of electrons in magnesium atoms is twelve. Magnesium’s electron structure shows that there are eight electrons in the L shell and two in K shell. There are also two electrons in magnesium’s M shell (orbit).

This means that the first magnesium shell has two electrons, while the second shell has eight electrons. The third shell has two electrons. Through the sub-orbit, the electron configuration for magnesium (Mg) is 1s2 2s2 2p6 3s2.

Calculate the total electrons and determine the valence shell

The third step is to determine the orbit of the valence shell. The valence shell is the last shell after the electron configuration. A valence electron is the total number of electrons found in a valenceshell. Magnesium(Mg) has two electrons. This is evident from its electron configuration. The valence electrons for magnesium therefore have two.

  1.  The valence is a numerical characteristic of the ability of atoms of a given element to bond with other atoms.
  2. The valence of hydrogen is constant and equal to one.
  3. The valence of oxygen is also constant and equal to two.
  4. The valence of most of the other elements is not constant. It can be determined by the formulas of their binary compounds with hydrogen or oxygen.

Magnesium compound formation (Mg)

Through its valence electrons, magnesium participates in bond formation. We know that there are two valence electrons found in magnesium (Mg). This valence electron is involved in the formation bonds with other elements.

The electron configuration for oxygen indicates that six have valence electrons. The magnesium atom gives its valence electrons and the oxygenatom receives them.

Therefore, oxygen acquires the neon electron configuration, while magnesium atoms acquire the neon electron configuration. Magnesium oxide (MgO), is created by the exchange electrons between one atom magnesium and one oxygen atom. Magnesium oxide (MgO), is an ionic bonding.

How many valence electrons does magnesium (Mg +2), have?

The electron configuration is completed when the magnesium last shell has two electrons. The valency for magnesium in this instance is 2. This is what we know. During bond formation, elements with 1, 2, or three electrons in their last shells donate those electrons to the next shell.

Cations are elements that create bonds through the donation of electrons. Magnesium is a cation-element. Magnesium gives away the electron from the last shell in order to form bonds, and then turns into magnesium ions.

How many valence electrons does magnesium ion(Mg+2) have

Magnesium ion (Mg+2), has an electron configuration of 1s2 2s2 2p6. Magnesium ions only have two shells, while the electron configuration of magnesium-ion reveals that the last shell contains eight electrons. The electron configuration indicates that the magnesium atom has the electron configuration, which is neon.

In this instance, the valence (valency) of the magnesium-ion is +2. The valence electrons for magnesium ion (Mg+2), are eight, since the last shell of a magnesium-ion contains eight electrons.

What is the valency for magnesium (Mg)?

Valency (or valence) is the ability of an atom of an element in forming a molecule to join another atom. There are a few rules that can be used to determine if valency is being detected. The valency of an element is the number of electrons found in an unpaired state in an orbital after an electron configuration is completed.

Magnesium has two unpaired electrons in its last orbital, according to the electron configuration.

What is the valency of magnesium(Mg)

Magnesium valency is therefore 2.


  • Atomic symbol (on Periodic Table of Elements: Mg).
  • 12 is the atomic number (number protons in the nucleus).
  • The average mass of an atom is called the atomic weight. It is 24.3050.
  • Phase at room temperature.
  • Most common isotopes: Mg-24 (78.99 percent natural abundance), Mg-25 (10 percent natural abundance), Mg-26 (11 percent natural abundance).
  • Density: 1.74g per cubic centimeter.
  • Melting point: 1,202 degrees Fahrenheit (650 degrees Celsius).
  • Number of stable isotopes (atoms with different numbers of neutrons from the same element): 21; 3.
  • Boiling point: 1,994 F (1.090 C).


  • Nancy E. Bernhardt, Artur M. Kasko, Nutrition for the Middle Aged and Elderly., (2008) p333. Nova Science Publishers
  • Emsley, John (2011). Nature’s building blocks: An A-Z Guide to the Elements. Oxford University Press. ISBN 978-0-19-960563-7.
  • Gschneider, K. A. (1964). Physical Properties and Interrelationships of Metallic and Semimetallic Elements. Solid State Physics.
  • Rumble, John R., ed. (2018). CRC Handbook of Chemistry and Physics (99th ed.). Boca Raton, FL: CRC Press. ISBN 978-1-1385-6163-2.
Alexander Stephenson

Candidate of Chemical Sciences, editor-in-chief of Lecturer at several international online schools, member of the jury of chemistry competitions and author of scientific articles.

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