Key concepts

The electrons neighboring an atom are situated in regions roughly the nucleus dubbed “energy levels”. An energy level to represent the 3-dimensional an are surrounding the nucleus whereby electrons space most likely to be. The very 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 than the second, and so on.Each energy level can accommodate or “hold” a different variety of electrons before added electrons start to get in the following level. As soon as the an initial energy level has actually 2 electrons, the next electrons go into the 2nd energy level until the second level has actually 8 electrons. Once the second energy level has actually 8 electrons, the following electrons get in the third energy level until the 3rd level has actually 8 electrons.When the 3rd energy level has 8 electrons, the next 2 electrons get in the fourth energy level.The electron in the energy level the furthest from the nucleus are dubbed valence electrons.Atoms in the same tower (group) in the routine table have actually the same number of valence electrons.


Students will again emphasis on the very first 20 elements. Students will first look in ~ a diagram and also animation to understand the simple pattern that the plan of electrons on energy levels approximately an atom. Students will certainly be offered cards through information about the electrons and also energy levels because that each the the first 20 atoms. They will again shot to correctly enhance the cards with each element.

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Students will be able to interpret the information provided in the regular table to describe the plan of electron on the power levels approximately an atom.


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

About this Lesson

Be certain that the 20 atom name cards room posted around the room. Friend will require the five cards top top the right hand side of every sheet. This class is intended together a follow-up to chapter 4, class 2.

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

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

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Show students the you have 80 cards (4 for each of the an initial 20 elements). Prior to distributing the cards, describe that each card contains information around electrons and also energy levels for the very first 20 aspects of the periodic table. The students’ task is to review the card carefully, figure out which element the card is describing, and put the card at the point out in the room for that element. Remind students that they will must count the electrons in bespeak to determine each atom. As soon as students know what their assignment is, distribute the cards come groups.


Have students look for fads in rows and columns that the an initial 20 elements in the periodic table.

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

Have students look in ~ the periods (rows walking across).

Number of power levels in every period

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

How the electrons fill in the power levels

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