Key ideas

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

Summary

Students will certainly again emphasis on the an initial 20 elements. Student will first look in ~ a diagram and also animation to understand the straightforward pattern of the arrangement of electrons on energy levels approximately an atom. Students will certainly be provided cards with information around the electrons and energy levels because that each of the first 20 atoms. They will again try to correctly complement the cards through each element.

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Objective

Students will have the ability to interpret the information given in the regular table to explain the setup of electrons on the energy levels around an atom.

Evaluation

Download the student activity sheet, and distribute one per student when specified in the activity. The activity sheet will serve together the “Evaluate” component of each 5-E lesson plan.

About this Lesson

Be certain that the 20 atom name cards room posted about the room. Girlfriend will need the five cards top top the appropriate hand next of every sheet. This class is intended together a follow-up to thing 4, lesson 2.

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


Have groups work together to place each card through its exactly atom.

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Show students the you have 80 cards (4 for each of the first 20 elements). Before distributing the cards, explain that each card contains information around electrons and energy levels because that the very first 20 elements of the regular table. The students’ job is to check out the card carefully, number out which element the map is describing, and also put the card at the point out in the room for that element. Repeat students that they will should count the electron in bespeak to identify each atom. When students understand what their assignment is, distribute the cards come groups.

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

Continue to project the image Periodic table of power levels for facets 1–20 and also have students look in ~ their activity sheets to discover patterns in the number of electrons within each power level.

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

Number of energy levels in every period

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

How the electrons fill in the energy levels

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