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Lewis Dot Diagram For Lead

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Last Updated: 19 October 2020

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Lewis uses simple diagrams to keep track of how many electrons were present in the outermost, or Valence, shell of the atom. The kernel of an atom, ie, nucleus together with inner electrons, is represented by a chemical symbol, and only Valence Electrons are drawn as dots surrounding the chemical symbol. Thus, three atoms shown in Figure 1 from Electrons and Valence can be represented by the following Lewis diagrams: if an atom is a noble - gas atom, two alternative procedures are possible. Either we can consider an atom to have zero Valence electrons or we can regard the outermost fill shell as a Valence shell. The first three noble gases can thus be written as: notice from the preceding example that Lewis diagrams of alkali metals are identical except for their chemical symbols. This agrees nicely with the very similar chemical behavior of alkali metals. Similarly, Lewis diagrams for all elements in other groups, such as alkaline earths or halogens, look the same. Lewis diagrams may also be used to predict valences of elements. Lewis suggested that the number of valences of an atom was equal to the number of Electrons in its Valence shell or to the number of Electrons which would have to be added to the Valence shell to achieve the electronic shell structure of the next noble gas. As an example of this idea, consider the elements Be and O. Their Lewis diagrams and those of noble gases He and Ne are compared to Be with He, We see that the former has two more Electrons and therefore should have Valence of 2. Element O might be expected to have Valence of 6 or Valence of 2 since it has six Valence electronstwo less than Ne. Using rules of Valence developed in this way, Lewis was able to account for the regular increase and decrease in subscripts of compounds in the table found in the Valence section, and reproduce them here. In addition, he was able to account for more than 50 percent of formulas in the table. Lewis ' success in this connection gives clear indication that electrons were the most important factor in holding atoms together when molecules form. Despite these successes, there are also difficulties to be found in Lewis theories, in particular for elements beyond calcium in the periodic table. Element Br, for example, has 17 more Electrons than noble - gas Ar. This leads us to conclude that Br has 17 Valence Electrons, which makes it awkward to explain why Br resembles Cl and F so closely even though these two atoms have only seven Valence Electrons. Draw Lewis diagrams for atom of each of the following elements: Li, N, F, Na. We find from the periodic table inside the front cover that Li has an atomic number of 3. It thus contains three electrons, one more than noble gas He.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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