![]() Here is a table representing the number of valence electrons of elements belonging to the second period and their electronic configuration. So, just by writing the electronic configuration of that element, we can quickly determine its number of valence electrons. ![]() The configuration of electrons gives a quick overview of the number of electrons present in the last shell. The arrangement of electrons in such orbitals is known as electronic configuration. Within the shells, electrons occupy a special place called atomic orbitals. By Using Electronic Configuration of the Element The table below depicts the number of valence electrons in the different groups of the periodic table: Periodic Table GroupĢ. The rule applies to the transition and inner transition elements in groups 3-12. However, this only holds for the main group elements, groups 1-2 and 13-18. Therefore, elements with the same number of valence electrons are. In contrast, the number of valence electrons across a period increases by one as we move left to right of a period.Įxception: As discussed, the period number indicates the number of shells, whereas the group number specifies the valence electron number in the outermost shell of an atom. About Transcript Valence electrons are the electrons in the outermost shell, or energy level, of an atom. The number of electrons in an atoms outermost valence shell governs its bonding behavior. As we proceed downwards in a group, the numbers of valence electrons are same, although the number of shells increases. Here, we just refer to the periodic table and search for the position of the element in it. As we continue through the periodic table in this way, writing the electron configurations of larger and larger atoms, it becomes tedious to keep copying the configurations of the filled inner orbitals. It is the most widely used method to determine the number of valence electrons in an element. We can see from the electron configuration of a carbon atom1 s2 2 s2 2 p2 that it has 4 valence electrons (2 s2 2 p2) and 2 core electrons (1 s2 ). There are two ways of calculating the number of valence electrons in an element. Valence shell electrons (or, more simply, the valence electrons) are the electrons in the highest-numbered shell, or valence shell, while core electrons are the electrons in lower-numbered shells.
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