Key principles

The electrons surrounding an atom are situated in regions approximately the nucleus dubbed “energy levels”. An power level represents the 3-dimensional an are surrounding the nucleus wherein electrons space most likely to be. The an initial energy level is closest come the nucleus. The 2nd energy level is a small farther away 보다 the first. The third is a small farther away than the second, and also so on.Each energy level have the right to accommodate or “hold” a different number of electrons before extr electrons begin to go into the following level. As soon as the first energy level has 2 electrons, the following electrons enter the second energy level till the 2nd level has actually 8 electrons. Once the 2nd energy level has actually 8 electrons, the next electrons go into the 3rd energy level till the third level has actually 8 electrons.When the 3rd energy level has 8 electrons, the following 2 electrons get in the fourth power level.The electrons in the power level the furthest from the nucleus are dubbed valence electrons.Atoms in the same pillar (group) in the periodic table have the same number of valence electrons.


Students will certainly again emphasis on the an initial 20 elements. Students will an initial look in ~ a diagram and animation to recognize the basic pattern the the plan of electrons on power levels approximately an atom. Students will certainly be given cards with information around the electrons and also energy levels for each that the very first 20 atoms. They will certainly again shot to correctly match the cards with each element.

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Students will have the ability to interpret the information provided in the routine table to explain the setup of electron on the power levels approximately an atom.


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

About this Lesson

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

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

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

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Show students the you have actually 80 cards (4 for each of the very first 20 elements). Before distributing the cards, define that every card includes information about electrons and also energy levels because that the very first 20 aspects of the routine table. The students’ task is to read the card carefully, number out which aspect the map is describing, and also put the map at the spot in the room for that element. Repeat students that they will have to count the electrons in stimulate to identify each atom. When students know what their assignment is, distribute the cards come groups.


Have students look for patterns in rows and also columns that the first 20 aspects in the periodic table.

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

Have student look in ~ the durations (rows walk across).

Number of energy levels in each period

The atom in the an initial period have actually electrons in 1 energy level.The atom in the second period have electrons in 2 power levels.The atoms in the third period have electrons in 3 power levels.The atoms in the fourth period 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 energy level = 1, 2, 3, …8