Key principles

The electrons bordering an atom are located in regions approximately the nucleus referred to as “energy levels”. An energy level represents the 3-dimensional an are surrounding the nucleus wherein electrons are most most likely to be. The first energy level is closest to the nucleus. The 2nd energy level is a small farther away than the first. The third is a tiny farther away than the second, and so on.Each power level can accommodate or “hold” a different number of electrons before added electrons start to get in the next level. When the first energy level has 2 electrons, the next electrons go into the second energy level until the 2nd level has actually 8 electrons. When the 2nd energy level has actually 8 electrons, the following electrons go into the 3rd energy level till the 3rd level has 8 electrons.When the 3rd energy level has actually 8 electrons, the next 2 electrons go into the fourth power level.The electrons in the energy level farthest from the cell nucleus are dubbed valence electrons.Atoms in the same obelisk (group) in the routine table have actually the same variety of valence electrons.


Students will again emphasis on the very first 20 elements. College student will an initial look at a diagram and also animation to know the straightforward pattern that the setup of electrons on power levels about an atom. Students will be given cards through information around the electrons and also energy levels because that each the the very first 20 atoms. They will again shot to correctly complement the cards through each element.

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Students will be able to interpret the information provided in the regular table to explain the arrangement of electron on the power levels around an atom.


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

About this Lesson

Be sure that the 20 atom name cards space posted around the room. Girlfriend will need the 5 cards top top the appropriate hand side of every sheet. This lesson is intended as a follow-up to thing 4, great 2.

For lesson 4.3, students can play the periodic Table Game, game #2. This is an online variation of the periodic table card game from this lesson that you have the right to assign as class work or homework ~ students have played the game in the classroom.

Have teams work with each other to ar each card through its exactly atom.

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Show students the you have actually 80 cards (4 because that each that the very first 20 elements). Before distributing the cards, define that every card has information around electrons and also energy levels because that the first 20 aspects of the periodic table. The students’ task is to review the card carefully, number out which element the map is describing, and also put the card at the clues in the room for that element. Repeat students that they will need to count the electrons in order to identify each atom. As soon as students know what their assignment is, distribute the cards to groups.


Have students watch for patterns in rows and also columns the the an initial 20 facets in the periodic table.

Continue to project the photo Periodic table of energy levels for elements 1–20 and also have students look in ~ their task sheets to uncover patterns in the variety of electrons in ~ each power level.

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

Number of power levels in every period

The atoms in the very first period have actually electrons in 1 energy level.The atoms in the second period have electron in 2 energy levels.The atoms in the third period have electron in 3 power levels.The atoms in the fourth period have electron in 4 energy levels.

How the electrons to fill in the power levels

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