Key ideas

The electrons surrounding an atom are located in regions roughly the nucleus dubbed “energy levels”. An energy level represents the 3-dimensional an are surrounding the nucleus where electrons room most most likely to be. The an initial energy level is closest come the nucleus. The second energy level is a little farther away 보다 the first. The 3rd is a small farther away 보다 the second, and also so on.Each energy level deserve to accommodate or “hold” a different variety of electrons before added electrons begin to go into the next level. As soon as the an initial energy level has 2 electrons, the following electrons enter the second energy level till the 2nd level has actually 8 electrons. When the 2nd energy level has actually 8 electrons, the next electrons get in the 3rd energy level until the third level has actually 8 electrons.When the 3rd energy level has actually 8 electrons, the next 2 electrons get in the fourth power level.The electrons in the power level the furthest from the nucleus are referred to as valence electrons.Atoms in the same column (group) in the routine table have actually the same number of valence electrons.

Summary

Students will certainly again focus on the first 20 elements. College student will first look at a diagram and also animation to recognize the an easy pattern that the setup of electrons on power levels about an atom. Students will certainly be offered cards through information about the electrons and energy levels for each the the an initial 20 atoms. They will again shot to correctly match the cards v each element.

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Objective

Students will have the ability to interpret the information provided in the periodic table to define the arrangement of electrons on the power levels around an atom.

Evaluation

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

About this Lesson

Be sure that the 20 atom surname cards room posted roughly the room. Girlfriend will need the 5 cards on the right hand side of each sheet. This lesson is intended together a follow-up to thing 4, great 2.

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


Have groups work with each other to place each card with its exactly atom.

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Show students the you have actually 80 cards (4 for each of the an initial 20 elements). Prior to distributing the cards, explain that every card consists of information about electrons and energy levels because that the an initial 20 elements of the periodic table. The students’ task is to check out the card carefully, figure out which aspect 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 electron in order to determine each atom. Once students recognize what your assignment is, distribution the cards to groups.

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

Continue to job the picture Periodic table of power levels for aspects 1–20 and also have college student look in ~ their activity sheets to uncover patterns in the number of electrons within each energy level.

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

Number of power levels in each period

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