The 2 electrons are on the first energy level.Įxplain that lithium has 3 protons and 3 electrons. The 1 electron is on the first energy level.Įxplain that helium has 2 protons and 2 electrons. Tell students that the rows across on the periodic table are called periods.Įxplain that hydrogen has 1 proton and 1 electron. This is why the electrons are often shown in pairs within an energy level. There can be a maximum of two electrons in each orbital. An orbital defines a region within an energy level where there is a high probability of finding a pair of electrons. This information is offered so that it is clearer to you why electrons are often shown in pairs in energy level diagrams. At the middle school level, it is not necessary for students to learn about electron orbitals. The pairing of electrons is meant to represent that pairs of electrons are in separate orbitals within each energy level. Some books show them spread out this way and some show them in pairs. Note: In the energy level diagrams, the electrons are spread out evenly in the level. Students will be able to interpret the information given in the periodic table to describe the arrangement of electrons on the energy levels around an atom. They will again try to correctly match the cards with each element. Students will be given cards with information about the electrons and energy levels for each of the first 20 atoms. Students will first look at a diagram and animation to understand the basic pattern of the arrangement of electrons on energy levels around an atom. Students will again focus on the first 20 elements.
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