What number of valence electrons does Strontium (Sr) possess?

What is the valency of strontium Valence electrons

Strontium is located in the fifth period of group II of the main (A) subgroup of the Periodic Table. Strontium is an element of the alkaline earth metal. Strontium can form bonds using elements of its valency. This article explains in detail how strontium’s “valence electrons” work. You can learn more after reading this article. The simple substance strontium is a soft, malleable and ductile silver-white alkaline earth metal.

What is strontium


It has a high chemical activity, in air it quickly reacts with moisture and oxygen, becoming covered with a yellow oxide film. While natural strontium (which is mostly an isotope of strontium-88) is stable, synthetic strontium-90 is radioactive and one of the most dangerous constituents of nuclear fallout, as strontium is absorbed by the body in a similar way to calcium. On the other hand, natural stable strontium is not hazardous to health.

Both strontium and strontianite were named after strontium. This is the village in Scotland where the mineral was first discovered in 1790 by Adair Craig and William Cruickshank. It was then identified as a new element the following year by its crimson red flame color. Humphrey first isolated strontium as a metal in 1808. He used the newly discovered electrolysis process. In the 19th century, strontium was mainly used to make sugar from honey beets.

Natural strontium, which is basically a stable isotope of strontium-88, is stable. However, synthetic strontium-90 is radioactive. It is also one of the most dangerous kernel components. Since strontium is absorbed in the same way as calcium, it is dangerous. However, natural stable strontium is safe for health.

Biological role

Acantharea, a large group of marine radiolarian protozoa, form complex strontium mineral skeletons. Most of the strontium absorbed by the body is in the bones. Human bones have a ratio of 1:1000 to 1:2000.

Place of strontium in the periodic table

Place of strontium in the periodic table

Chemical properties of strontium:

Chemical properties 
Oxidation states0, +1, +2
electronegativity0.95 (Pauling scale)
Ionization energy (first electron)549.47 kJ/mol (5.69486740 (13) eV)
Electrode potentialSr  2+   + 2e    → Sr, E  o   \u003d -2.888 V
The affinity energy of an atom for an electron5.023 (6) kJ/mol (0.05206 (6) eV)

Strontium in the periodic table takes 38th place, in the 5th period.

Atomic weight87.6200000

What are the valence neutrons in strontium?

Strontium is the fourth group 2 element. All group 2 elements are alkali metals. Thus, strontium is an alkaline earth metal. The number of electrons in the last orbit is called the “valence electron”.

The valency of strontium is the sum of all the electrons in the shell after the strontium configuration. Valence elements are responsible for determining the properties of the element and are involved in the formation of bonds.

Physical properties of strontium:

Physical properties
Density*2.64 g / cm3  (at 20 ° C and other standard conditions the state of the substance is solid), 2.375 g / cm3  (at a melting point of 777 ° C and other standard conditions the state of the substance is liquid)
Melting temperature*777 °C (1050 K, 1431 °F)
Boiling temperature*1377 °C (1650 K, 2511 °F)
sublimation temperature
Decomposition temperature
Self-ignition temperature of the gas-air mixture
Specific heat of fusion (enthalpy of fusion ΔH  pl  )*7.43 kJ/mol
Specific Heat of Vaporization (Enthalpy of Boiling ΔH  Thousand Pounds  )*141 kJ/mol
Specific heat capacity at constant pressure0.31 J/g K (at 25°C)
Molar heat capacity*26.4 J/(K mol)
Molar volume33.315589 cm³/mol
Thermal conductivity35.4 W/(m K) (under standard conditions), 35.4 W/(m K) (at 300 K)
Thermal expansion coefficient22.5 µm/(MK) (at 25°C)

How many protons or electrons does strontium have?

The nucleus is located in the center of the atom. The nucleus contains protons and neutrons. 38 is the atomic number of strontium. The number of protons in strontium is called the “atomic number”. This means that strontium has a total of thirty-eight protons. The ring shell is located outside the nucleus and contains electrons equal to protons. A strontium atom contains only 33.8 electrons.

How to calculate the number of valence electrons in a strontium atom?

By following a few steps, you will be able to determine the valency of electrons. One of them is the electronic configuration. Without the electronic configuration, it is impossible to determine the valence electrons. It is easy to determine the electronic configuration of all elements.

How to calculate the number of valence electrons in a strontium atom?

However, it is possible to identify the valence elements simply by arranging the electrons according to Bohr’s principle. This is how we can determine the electron valency of strontium.

Calculation of the total number of electrons present in strontium

First we need to determine the total number of electrons in the strontium atom. The number of protons in strontium is required to calculate the number of electrons. You also need to know the atomic numbers of the elements of strontium in order to determine the number of electrons.

The periodic table can be used to calculate atomic numbers. The periodic table contains the information needed to determine the atomic number of the elements of strontium. The number of protons in an atom is known as the atomic number. Also, electrons equal to protons can be found outside the nucleus.

Thus, we can conclude that the electrons present in the strontium atoms are equal to each other. We see that strontium has atomic number 38 from the periodic table. The total number of electrons in a strontium atom is 38.

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).

Perform electron configuration of strontium

Step 2 is critical. This step requires the arrangement of electrons in strontium. We know that strontium has only 38 electrons. The first shell of strontium consists of two electrons. The second shell contains eight electrons. The third shell contains eighteen electrons. The fourth shell contains eighteen electrons. The fifth shell has four electrons. The number of electrons in the shell of strontium has two, eight, 18, eight and two.

Determine the valence shell and calculate the total number of electrons

The third step involves the diagnosis of the valence shell. The valence shell is the shell corresponding to the electronic configuration. The total number (or valency) of electrons in a valence shell is called valence electrons. The electron configuration indicates that the last shell (5s 2 ) of strontium contains two electrons. Thus, strontium (Sr) has two valence 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.

How many valence elements does the strontium ion (Sr 2+ ) contain?

When a bond is formed, elements with 1 or 2 electrons in a shell donate electrons to a shell containing 3 electrons. Cations are elements that donate electrons to form bonds. Two electrons are donated by the strontium atom to form bonds. Strontium is a cationic element.

How many valence electrons does a strontium ion (Sr2+) have?

The electronic configuration of strontium (Sr2+), the strontium ion (Sr2+), can be described as 1s2  2s2  2p6  3s2  3p6  3d10  4s2  4p6. This electron configuration shows that strontium has four shells. The last shell contains eight electrons (4s2 4p 6). However, the strontium ion (Sr2+) has now acquired the electronic configuration of krypton. Since the eight electrons in the last shell of the strontium ion have eight, the eight valence electrons of strontium (Sr2+) are eight.

  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 is the valency of strontium?

Valency is the ability of one atom of an element to bond with another during the formation of a molecule. The valency of an element refers to the number of electrons that remain unpaired in its last orbit. Two electrons are donated by a strontium atom to another atom when a compound is formed. Thus, the valency of strontium is 2.

What is the valence of strontium

These are some interesting facts

  • Strontium, a naturally occurring element, is the 15th most abundant element in the earth’s crust.
  • Graphically, the element is represented by an abstract image of a metallic mushroom cloud. This indicates its presence in the nuclear torch.
  • It reacts with water to form strontium hydroxide. It is a serious irritation to the eyes, skin and respiratory tract.



Alexander Stephenson

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

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