Lewis Electron Dot Structure Calculator

Learning Objectives

By the end of this section, you will be able to:

A step-by-step explanation of how to draw the MgF2 Lewis Dot Structure.For MgF2 we have an ionic compound and we need to take that into account when we draw. In a similar sense, the two Lewis structures for the SO 2 molecule are in resonance. They mix to give a hybrid that is more than the sum of its components. The fact that SO 2 is a resonance hybrid of two Lewis structures is indicated by writing a double-headed arrow between these Lewis structures, as shown in.

  • Write Lewis symbols for neutral atoms and ions

Lewis Symbols of Monoatomic Elements

In almost all cases, chemical bonds are formed by interactions of valence electrons in atoms. To facilitate our understanding of how valence electrons interact, a simple way of representing those valence electrons would be useful.

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  3. Draw the Lewis electron dot structures for the following compound. Calculate the formal charge on each atom in wach structure and if theres is more than one possible structure for the compound use formal charge to indicate the more likely structure. Label all bonds as being polar or nonpolar.

A Lewis electron dot diagram (or electron dot diagram or a Lewis diagram or a Lewis structure) is a representation of the valence electrons of an atom that uses dots around the symbol of the element. The number of dots equals the number of valence electrons in the atom. These dots are arranged to the right and left and above and below the symbol, with no more than two dots on a side. (It does not matter what order the positions are used.)

For example, the Lewis electron dot diagram for calcium is simply

Figure 1 shows the Lewis symbols for the elements of the third period of the periodic table.

Figure 1. Lewis symbols illustrating the number of valence electrons for each element in the third period of the periodic table.

Lewis symbols can also be used to illustrate the formation of cations from atoms, as shown here for sodium and calcium:Likewise, they can be used to show the formation of anions from atoms, as shown below for chlorine and sulfur:Figure 2 demonstrates the use of Lewis symbols to show the transfer of electrons during the formation of ionic compounds.

Figure 2. Cations are formed when atoms lose electrons, represented by fewer Lewis dots, whereas anions are formed by atoms gaining electrons. The total number of electrons does not change.

Example 1: Writing Lewis DoT SYmbols of Elements

What is the Lewis electron dot diagram for each element?

  1. aluminum
  2. selenium
Show Answer
  1. The valence electron configuration for aluminum is 3s23p1. So it would have three dots around the symbol for aluminum, two of them paired to represent the 3s electrons (or three single dots around the atom):

  2. The valence electron configuration for selenium is 4s24p4. In the highest-numbered shell, the n = 4 shell, there are six electrons. Its electron dot diagram is as follows:

Check Your Learning

What is the Lewis electron dot diagram for each element?

  1. phosphorus
  2. argon

Lewis Electron Dot Structure Calculator Answer

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Example 2: Writing Lewis DoT SYmbols of Ions

What is the Lewis electron dot diagram for each ion?

  1. Ca2+
  2. O2−
Show Answer
  1. Having lost its two original valence electrons, the Lewis electron dot diagram is just Ca2+.

    Ca2+

  2. The O2− ion has gained two electrons in its valence shell, so its Lewis electron dot diagram is as follows:

Check Your Learning

The valence electron configuration of thallium, whose symbol is Tl, is 6s25d106p1. What is the Lewis electron dot diagram for the Tl+Ios app store for pc. ion?

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Key Takeaways

  • Lewis electron dot diagrams use dots to represent valence electrons around an atomic symbol.
  • Lewis electron dot diagrams for ions have fewer (for cations) or more (for anions) dots than the corresponding atom.

Exercises

1. Explain why the first two dots in a Lewis electron dot diagram are drawn on the same side of the atomic symbol.

2. Is it necessary for the first dot around an atomic symbol to go on a particular side of the atomic symbol?

3. What column of the periodic table has Lewis electron dot diagrams with two electrons?

4. What column of the periodic table has Lewis electron dot diagrams that have six electrons in them?

5. Draw the Lewis electron dot diagram for each element.

a) strontium

b) silicon

6. Draw the Lewis electron dot diagram for each element.

a) krypton

b) sulfur

7. Draw the Lewis electron dot diagram for each element.

a) titanium

b) phosphorus

8. Draw the Lewis electron dot diagram for each element.

a) bromine

b) gallium

9. Draw the Lewis electron dot diagram for each ion.

a) Mg2+

b) S2−

10. Draw the Lewis electron dot diagram for each ion.

a) In+

b) Br

11. Draw the Lewis electron dot diagram for each ion.

Lewis Electron Dot Structure Calculator

a) Fe2+

b) N3−

12. Draw the Lewis electron dot diagram for each ion.

a) H+

b) H

Show Select Answer

1. The first two electrons in a valence shell are s electrons, which are paired.

3. The second column of the periodic table

5.

a)

Lewis dot structure practice worksheet

b)

7.

a)

b)

9.

Lewis Electron Dot Structure Calculator Function

a) Mg2+

b)

11.

Lewis Electron Dot Structure

a) Fe2+

Lewis Electron Dot Structure Calculator Formula

b)