![]() This is strictly true for all elements in the s and p blocks. Elements in each column have the same valence shell electron configurations, and the elements have some similar chemical properties. The next two electrons, for Li and Be, would go into the 2s subshell. The number of valence electrons indicates the maximum number of chemical bonds an atom can form. For the transition metals with partially-filed d shells, valence electrons are those electrons outside the noble gas core. These two elements make up the first row of the periodic table (see Figure 8.9 The 1s Subshell). Valence electrons are outer shell electrons for main group elements. The same concept applies to the other columns of the periodic table. Their electron configurations are 1 s1 and 1 s2, respectively with He, the n 1 shell is filled. The organization of electrons in atoms explains not only the shape of the periodic table, but also the fact that elements in the same column of the periodic table have similar chemistry. Because much of the chemistry of an element is influenced by valence electrons, we would expect that these elements would have similar chemistry- and they do. They all have a similar electron configuration in their valence shells: a single s electron. Their electron configurations (abbreviated for the larger atoms) are as follows, with the valence shell electron configuration highlighted: Electrons, electron configurations, and the valence shell electron configuration highlighted. ![]() ![]() For example, take the elements in the first column of the periodic table: H, Li, Na, K, Rb, and Cs. If we look at just the valence shell’s electron configuration, we find that in each column, the valence shell’s electron configuration is the same. (The inner electrons are called core electrons.) The valence electrons largely control the chemistry of an atom. Its compound is mostly present in the form of rocks, vegetation, and animals. ![]() Valence electrons : 2: Valency electrons : 7: Bohr model: Electron shell for Rhenium, created by Injosoft AB Re. Aluminum is in silvery-white color metal. Rhenium is a chemical element of the periodic table with chemical symbol Re and atomic number 75 with an atomic weight of 186.207 u and is classed as a transition metal. The electrons in the highest-numbered shell, plus any electrons in the last unfilled subshell, are called valence electrons the highest-numbered shell is called the valence shell. Aluminum Valence Electrons: Aluminum is the chemical element denoted with a symbol (Al) and with an atomic number 13. The periodic table is separated into blocks depending on which subshell is being filled for the atoms that belong in that section. ![]()
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