How to Determine the Correct Valence Electrons? Here is a Complete Guide for Beginners

How to determine valence electrons (Image Zenartix-Freepik)

YOGYAKARTA - In chemistry, the way to determine valence electrons is an important step used to understand the chemical properties of an element, especially in the formation of chemical bonds. Valence electrons are electrons in the outermost layer of the atom and play an active role in chemical reactions.

Therefore, knowing how to determine valence electrons is very important to study the structure of molecules, bonds, and the reactivity of elements. This article will explain in full detail how to determine valence electrons easily.

Valence electrons are electrons located in the outermost shell or outermost energy level of an atom. These electrons play a major role in the process of forming chemical bonds, whether covalent or ionic bonds. Each chemical element has a different number of valence electrons, depending on the number of the element in the periodic table.

For example, the carbon (C) element located in group IV A has 4 valence electrons, while the oxygen (O) element in group VI A has 6 valence electrons. Understanding of valence electrons will help us in understanding how atoms bond with each other to form compounds.

To be able to determine the valence electrons of an element, there are several steps that need to be followed. Here's how to determine the valence electrons easily:

1. Identification of the Elements in the Periodic Table

The first step in how to determine valence electrons is to know the element's group in the periodic table. Elements in the periodic table are grouped by their groups. The number of valence electrons usually corresponds to the number of the element's group, especially for elements in the main group.

Example: The element sodium (Na) is located in the IA group, so it has 1 valence electron.

2. Pay Attention to the Electron Number on the Outer Shell

For elements that are in higher periods (such as transition elements), the number of valence electrons can be found by looking at the number of electrons in the atom's outermost shell. Although the classification of these elements is more complicated, the basic principle remains the same. You can refer to the periodic table to find out the number of electrons in the outermost shell of the element.

3. Apply Rules to Transition Elements

For transition elements, the way to determine the valence electrons can be a little more complicated because the valence electrons are not only located in the outermost shell, but can also be in the d subshell. In transition elements, the number of valence electrons can be calculated by summing the electrons in the outermost s and d shells.

For example, the iron (Fe) element in period 4 and group VIIIA has an electron configuration [Ar] 3d⁶ 4s². Its valence electrons are 2 from 4s and 6 from 3d, so there are a total of 8 valence electrons.

4. Use Electron Configuration to Determine Valence Electrons

Another way to determine valence electrons is to look at the atom's electron configuration. The electron configuration identifies how the electrons are spread across the atom's shells, including the outermost shell that contains the valence electrons. The electrons in this outermost shell can be counted to find the number of valence electrons.

For example, carbon (C) has an electron configuration of 1s² 2s² 2p². From this configuration, we can see that carbon has 4 valence electrons located in the second shell (2s² 2p²).

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5. Check by Using Lewis Diagrams

After knowing the number of valence electrons, you can use the Lewis diagram to illustrate the valence electrons. The Lewis diagram will help you visualize how the valence electrons are used in the formation of chemical bonds. In this diagram, each point or line represents a pair of electrons around the atom.

6. Why is knowing the valence electrons important?

Knowing how to determine the valence electrons is very important because valence electrons play a direct role in the formation of interatomic bonds. The chemical bonds formed, whether covalent or ionic bonds, depend heavily on the number and distribution of these valence electrons. In addition, understanding valence electrons also helps in understanding the physical and chemical properties of an element, such as melting point, electrical conductivity, and stability.

How to determine the valence electrons is an important basis in studying chemistry and understanding the reactivity of atoms. By knowing the number of valence electrons, we can predict how atoms bond and form compounds. The steps described above provide an easy and practical way to determine the number of valence electrons of an element. Hopefully this article can help you understand this concept better! In addition, get to know also 5 Crazy Science Experiments That Have Ever Been Done

By following the steps above, you will be easier to understand and calculate valence electrons, which is of course very useful in various chemical applications.

So after knowing how to determine valence electrons, check out other interesting news at VOI.ID, it's time to revolutionize reporting!