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The identical number of valence electrons primarily accounts for the similar properties of elements in the same group. Determining Valence Electrons Back to Top. The valence electron configuration of an atom helps us understand its properties and can be ascertained from the periodic table. The valence electrons of the transition metal atoms are held rather loosely by the nuclei and the atoms have no great affinity for more electrons. It needs four electrons to complete its octet. For example, lets consider the water molecule. Number of Valence Electrons Back to Top.



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6 Annonce Com Valence
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Helium - This element has 2 electrons, both of which occupy the K shell. For transition elements the valence electrons are those in the outermost s sub-shell and in the d sub-shell of the next to outermost energy shell. Some of the examples of valence electrons of different atoms are given below. The elements in a group of the periodic table have the same number of valence electrons in the same shapes of orbitals.
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