Key concepts

The electrons bordering an atom are located in regions roughly the nucleus referred to as “energy levels”. An energy level represents the 3-dimensional space surrounding the nucleus whereby electrons room most likely to be. The first energy level is closest come the nucleus. The second energy level is a tiny farther away than the first. The 3rd is a little farther away 보다 the second, and so on.Each energy level have the right to accommodate or “hold” a different variety of electrons before extr electrons begin to go into the next level. When the first energy level has 2 electrons, the next electrons go into the second energy level till the second level has actually 8 electrons. As soon as the second energy level has 8 electrons, the next electrons go into the third energy level until the third level has actually 8 electrons.When the 3rd energy level has actually 8 electrons, the following 2 electrons go into the fourth power level.The electrons in the energy level farthest from the cell nucleus are called valence electrons.Atoms in the same tower (group) in the periodic table have the same variety of valence electrons.


Students will certainly again emphasis on the first 20 elements. Students will very first look in ~ a diagram and animation to know the basic pattern that the setup of electrons on energy levels roughly an atom. Students will be given cards v information about the electrons and energy levels for each that the an initial 20 atoms. They will certainly again shot to correctly match the cards v each element.

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Students will be able to interpret the information given in the regular table to describe the setup of electrons on the power levels around an atom.


Download the student task sheet, and distribute one every student once specified in the activity. The task sheet will serve together the “Evaluate” component of every 5-E class plan.

About this Lesson

Be certain that the 20 atom surname cards are posted about the room. Friend will need the five cards top top the best hand next of each sheet. This lesson is intended as a follow-up to thing 4, lesson 2.

For class 4.3, students deserve to play the periodic Table Game, video game #2. This is one online version of the routine table card game from this lesson that you can assign as course work or homework ~ students have actually played the video game in the classroom.

Have teams work with each other to ar each card v its correct atom.

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Show students the you have 80 cards (4 because that each of the an initial 20 elements). Prior to distributing the cards, explain that each card has information about electrons and also energy levels for the first 20 facets of the periodic table. The students’ project is to review the card carefully, figure out which facet the card is describing, and also put the map at the point out in the room for the element. Repeat students the they will have to count the electrons in order to determine each atom. When students recognize what your assignment is, distribution the cards to groups.


Have students look at for fads in rows and columns that the an initial 20 facets in the regular table.

Continue to project the picture Periodic table of power levels for elements 1–20 and also have students look in ~ their activity sheets to find patterns in the number of electrons in ~ each energy level.

Have students look at the periods (rows going across).

Number of power levels in each period

The atoms in the an initial period have actually electrons in 1 power level.The atoms in the second duration have electron in 2 power levels.The atom in the third duration have electrons in 3 energy levels.The atoms in the fourth period have electron in 4 energy levels.

How the electrons to fill in the power levels

First energy level = 1, 2Second energy level = 1, 2, 3, …8Third energy level = 1, 2, 3, …8