# Dot Diagrams Are Used to Represent

Dot Diagrams Are Used to Represent.

Contents

### Learning Objectives

Past the terminate of this section, you will be able to:

• Write Lewis symbols for neutral atoms and ions

## Lewis Symbols of Monoatomic Elements

In about all cases, chemical bonds are formed past interactions of valence electrons in atoms. To facilitate our agreement of how valence electrons collaborate, a simple way of representing those valence electrons would be useful.

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 effectually 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 social club the positions are used.)

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

Effigy one shows the Lewis symbols for the elements of the third period of the periodic tabular array.

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

Lewis symbols tin can also be used to illustrate the formation of cations from atoms, as shown here for sodium and calcium:Likewise, they can exist used to testify the germination 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 germination of ionic compounds.

Figure two. 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 non change.

### Example 1: Writing Lewis DoT SYmbols of Elements

What is the Lewis electron dot diagram for each chemical element?

1. aluminum
2. selenium

What is the Lewis electron dot diagram for each element?

1. phosphorus
2. argon

### Instance 2: Writing Lewis DoT SYmbols of Ions

What is the Lewis electron dot diagram for each ion?

1. Ca2+
2. O2−

The valence electron configuration of thallium, whose symbol is Tl, is 6due south
two5d
106p
1. What is the Lewis electron dot diagram for the Tl+
ion?

### Key Takeaways

• Lewis electron dot diagrams employ dots to correspond 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 kickoff 2 dots in a Lewis electron dot diagram are drawn on the same side of the diminutive symbol.

two.  Is it necessary for the first dot around an diminutive symbol to get 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 cavalcade 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

vi.  Depict the Lewis electron dot diagram for each chemical element.

a)  krypton

b)  sulfur

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

a)  titanium

b)  phosphorus

eight.  Draw the Lewis electron dot diagram for each chemical element.

a)  bromine

b)  gallium

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

a)  Mgtwo+

b)  Southward2−

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

a)  In+

b)  Br

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

a)  Fe2+

b)  N3−

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

a)  H+

b)  H

## Dot Diagrams Are Used to Represent

Source: https://courses.lumenlearning.com/suny-mcc-introductorychemistry/chapter/lewis-electron-dot-diagrams/