How many valence electrons does Calcium have?

What is the valency of calcium Valence electrons

Calcium is the 20 th elements in the periodic table. Calcium is an alkaline metal. Its symbol is ‘Ca. Calcium is involved in the formation bonds via its valence electrons. This article will discuss in detail about the valence electrons for calcium(Ca). This article will hopefully help you to understand more about it.

It is the most common metallic element in humans, and fifth in Earth’s crust. Calcium carbonate is the most common calcium compound found on Earth. It can be found in limestone, fossilised remains of early sea life, and apatite. Named after Latin calx ” limestone “, which was made from heating limestone.

Calcium element


Calcium is fifth most common element in the earth’s crust. However, it is not easily found in nature as it forms compounds with oxygen water. Sir Humphry Davy was the first to isolate metallic calcium in 1808. He did this by electrolysis of a mixture consisting of lime (CaO), mercuric oxide, (HgO), and water. Calcium makes up 4.2% of Earth’s crust. Metallic calcium can be obtained today by replacing calcium atoms with lime with atoms aluminum in high-pressure, hot containers.


Calcium metal can be used to reduce other metals like uranium and thorium. It can also be used to alloy aluminium, beryllium and copper as well as lead and magnesium alloys. Gypsum (calcium sulfurate) is used as a plaster by builders and nurses to set bones. It’s also known as the ‘plaster de Paris’ by nurses.

Calcium compounds are used extensively. Limestone (calcium carbonate), which is a form of limestone, can be used as a building material and for indirect cement production. Calcium oxide is formed when limestone is heated in kilns. Slaked lime is formed when this reacts with water. Slaked lime can be used in cement making, soil conditioning, water treatment to lower acidity and in the chemical industry. Slaked lime is used to remove impurities in molten iron ore. Mixing slaked lime with sand releases carbon dioxide from the atmosphere and forms lime plaster.

Position of Calcium in the periodic table

Position of Calcium in the periodic table

Natural abundance

The fifth most abundant metal in Earth’s crust is calcium (4.1%) It can be found in many forms, including limestone (calcium carbonate), fluorite(calcium fluoride), and fluorite (calcium sulfate). Hard water is composed of dissolved calcium bicarbonate. This water filters through the ground to reach a cave where it precipitates into stalactites or stalagmites.

atomic number 20
atomic weight 40.078
boiling point 1,484 °C (2,703 °F)
melting point  842 °C (1,548 °F)
specific gravity 1.55 (20 °C, or 68 °F)
oxidation state +2
electron configuration 1s22s22p63s23p64s2

Health benefits of calcium

Calcium is the most abundant metal in the human body. It is the main component of bones and teeth and has key metabolic functions.Sometimes calcium is called lime. Calcium is found most often in milk and dairy products, but it can also be found in vegetables, beans, and nuts. It is essential for maintaining the human skeleton, teeth and other vital components.

It is also essential for the function of nerves, muscles, and other body systems. Calcium intakes exceeding 2,5 grams per day can cause kidney stones, sclerosis and damage to blood vessels and kidneys. One of the leading causes of osteoporosis is a deficiency in calcium. Osteoporosis refers to a condition in which bones become very porous and are susceptible to fracture. It is most common in women after menopause.

Biological role

Calcium is vital for all living things, especially for healthy bones and teeth. Calcium phosphate, the main component of bone, is also important. Pregnant women and children should eat calcium-rich foods, such as milk, dairy products, and leafy green vegetables.

What are the valence electrons for Calcium (Ca)?

Calcium is the 3 rd member of group-2. Alkaline earth metals are all elements in group 2. Calcium is therefore an alkaline metal. The total number of electrons in a given orbit is called the valence electron. The valence electrons for calcium (Ca) are the total number of electrons remaining in the shell after the electron configuration. The properties of an element are determined by the valence electrons. They also participate in the formation bonds.

What are the valence electrons of calcium(Ca)

What number of protons, electrons, and neutrons does a Calcium atom have?

The nucleus can be found in the middle of an atom. The nucleus is home to protons and neutrons. Calcium has an atomic number 20. The number of protons is called the atomic number. The number of protons found in calcium is twenty. The nucleus contains an electron shell that is equal to the protons. This means that the total number of electrons in a calcium atom is twenty.

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

We know that the atomic quantity of calcium is 20. The atomic mass number for this mineral is 40.08u. Neutron (n) = 40 – 20 = 20. The number of neutrons found in calcium(Ca) therefore, is 20.

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 find the number of valence neutrons in a calcium (Ca) 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 an electron. It is easy to identify the configuration of each element. 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 calcium (Ca).

Calculating the total number electrons in calcium

1st we need to know the total number of electrons in the calcium atom. You need to know how many protons are in calcium to determine the number electrons. To know the number protons in calcium, you must also know the atomic number for that element. A periodic table is required to determine the atomic number. The periodic table contains the atomic number for calcium (Ca) 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 calcium atom is equal to its atomic number. The periodic table shows that calcium (Ca) has an atomic number 20. This means that the total number of electrons in the calcium atom is twenty.

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.

You will need to perform electron configuration of calcium

Important step 2 This step involves the arrangement of the electrons in calcium (Ca). We know that the total number of electrons in calcium atoms is twenty. The electron configuration of calcium shows that the first calcium atom has two electrons. The second calcium atom has eight electrons. The third shell has eight electrons. The fourth shell has two electrons. Through the sub-orbit, the electron configuration of calcium is 1s2 2s2 2p6 3s2 3p6 4s2.

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. The electron configuration of calcium shows the last shell has two (4s2) electrons. The valence electrons for calcium (Ca) are therefore 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.

What number of valence electrons does Calcium ion (Ca +2) have?

During bond formation, elements with 1, 2, or three electrons in their last shell donate electrons to the previous shell. A cation is an element that donates electrons to form bonds. Two electrons from the shell of calcium are donated to form a bond, and then it becomes a calcium ion (Ca+2). Calcium is a cation element.

What number of valence electrons does Calcium ion (Ca +2) have

The electron configuration for calcium ion (Ca+2) is 1s2 2s2 2p6 3s2 3p6. The electron configuration of calcium ion(Ca+2) shows that calcium ion has three shells and the last shell has eight electrons (3s2 3p6). This electron configuration indicates that the calcium atom is now and has the electron configuration of the argon . The valency for the calcium-ion in this instance is +2. The valence electrons for calcium-ion (Ca+2), are eight, since the shell that contains the calcium-ion’s last electron has eight electrons.

What is the calcium valency?

Valency (or valence) is the ability of an atom of an element in a molecule to join another atom during formation. There are a few rules that can be used to determine valency. The valency of an element is the number of electrons found in an unpaired state in an orbital after an electron configuration is completed. Calcium gives two electrons from the last shell to form bonds.

What is the valency of calcium

Calcium’s valency is therefore 2.

Effects of calcium

Aquatic organisms are very sensitive to calcium phosphide.

Caclium Sulfate
Blackboard chalk is also made from calcium compounds! Calcium sulfate is also known as Gypsum and has the chemical formula CaSO42H2O.
Calcium chloride
Calcium chloride, a white powder with chemical formula CaCl2, is a calcium chloride. When used as salt, calcium chloride prevents ice from forming on sidewalks and roads. Calcium chloride is also used in food chemistry as a preservative or firming agent.
Calcium Hydroxide
Calcium hydroxide is a white powder with the chemical formula Ca(OH)2. Lime is the more common name. Calcium hydroxide is used in many food processing processes, including pickling.
Calcium Citrate
Calcium citrate can be described as a calcium salt from citric acid. Calcium citrate is often used as the source of calcium in calcium prescriptions. It is also found in certain foods.
Calcium Compounds
Many compounds can be made from calcium. Here are some examples of calcium compounds.
Calcium Cyclamate
Ca(C6H11NHSO4)2. Because it is highly soluble in water, and stable at high temperatures, this compound is often used as a sweetener. It has no nutritional value.
Calcium Gluconate
Calcium gluconate is used to treat low calcium levels. It can be prescribed or used as an emergency procedure. A tube of calcium-gluconate (or hydrofluoric acid) is kept in case of an emergency.
Calcium Hypochlorite
Many items can be disinfected with calcium hypochlorite  (Ca(OCl)2). It’s often found in deodorants, bleaching agents, and swimming pool disinfectants.
Calcium Carbonate
Calcium carbonate is known by the chemical formula CaCO3. This calcium salt is colorless and white. It is insoluble in water. Calcium carbonate is used to treat heartburn and is the main ingredient of Tums.
Calcium Arsenate
Calcium arsenate (Ca(AsO4)2), is a toxic calcium compound. Because of its toxic effects, insecticides often contain this molecule.


  • Calcium ion is often smelt by animals and people. It is often described as having a mineral, salty, or sour taste.
  • Calcium, which makes up 3.22%, is the fifth most abundant element in Earth’s crust.
  • Calcium metal is quite soft and easy to cut with a knife. However, it can be more difficult than lead.
  • Calcium is the major component of teeth, bones and cartilage. Too much calcium can cause kidney stones and artery calcification.
  • In a flame testing, calcium can cause severe burns.
  • The fifth most abundant element in the human organism is calcium. After all water has been removed, calcium accounts for approximately one-third of the body’s mass.
  • Calcium metal reacts exothermically to water and acid. Contact with calcium metal on the skin can cause irritation, corrosion, or chemical burns. The burns that calcium metal can cause can make it fatal if you inhale or ingest it.
  • China, the United States and India are the top three producers of calcium.
  • To deepen the color, fireworks contain calcium. To produce orange fireworks, calcium salts are used.


  • Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.)
  • John W. Morse, Rolf S. Arvidson, and Andreas Lüttge. “Calcium Carbonate Formation and Dissolution”. Chemical Reviews, 2007.
  • Jaime Wisniak, Jöns Jacob Berzelius A Guide to the Perplexed Chemist., Chem. Educator, 2000.
  • Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing.
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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