How are Lewis dot diagrams used to represent ionic compounds?

Answer 1

Most of the time, the Lewis structure of the individual ions are ignored.

Let's take a simple example: #"sodium sulfate,"# #Na_2SO_4#. As a salt, this is clearly electrostatically neutral, however, we can dig a bit deeper, and represent its Lewis structure.
For the positive sodium ions, we have #2xxNa^+#; the individual sodium ion has 10 electrons, and is thus a cation. Why?
For #"sulfate dianion"#, we have #6+4xx6+2# electrons to distribute, and this represents the 6 valence electrons from the 5 chalcogen atoms, plus the 2 electrons that constitute the negative charge.
A Lewis structure of #(O=)_2S(-O^(-))_2# in which the neutral atoms are each associated with 6 valence electrons, and the anionic oxygens with 7 valence electrons (and hence the negative charges) is commonly invoked. Such a structure implies the equivalence of ALL of the oxygen atoms, in that we can draw resonance structures in which the negative charges can reside on any two oxygen atoms.
A representation as #""^(2+)S(-O)""_4^(-)# is contraindicated by standard rules of Lewis structure determination, even tho it is a fact that all the oxygen atoms are equivalent. Representation of sulfate as #(O=)_2S(-O^(-))_2#, and the parent sulfuric acid as #(O=)_2S(-OH)_2# are what you will generally find in a text. The Lewis representation of #"sulfuric acid"#, and #"nitric acid"#, #O=N^(+)(-O^(-))(OH)#, are thus both a bit problematic.
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Answer 2

Lewis dot diagrams are used to represent ionic compounds by showing the transfer of electrons from one atom to another. Each atom's symbol is surrounded by dots representing valence electrons. For example, in sodium chloride (NaCl), sodium donates one electron to chlorine, forming Na+ and Cl- ions. In the Lewis dot diagram, Na is represented with one dot and Cl with seven dots.

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Answer 3

In Lewis dot diagrams, the valence electrons of each atom are represented as dots around the symbol of the element. For ionic compounds, the transfer of electrons from one atom to another results in the formation of ions.

To represent an ionic compound using Lewis dot diagrams, you would first draw the Lewis dot diagrams for each element involved in the compound, showing the transfer of electrons. For example, in sodium chloride (NaCl), sodium (Na) transfers one electron to chlorine (Cl) to form Na+ and Cl- ions.

The Lewis dot diagram for Na would show one dot (representing the transferred electron) next to the Na symbol, and the Lewis dot diagram for Cl would show seven dots (representing its original seven valence electrons) and one cross (representing the electron it gains from Na) next to the Cl symbol.

In the final Lewis dot diagram for the ionic compound NaCl, you would show the Na+ ion next to the Cl- ion, indicating that they are held together by ionic bonds due to the attraction between the oppositely charged ions.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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