Chemistry: Unit 1.5 Electron Arrangement in Atoms

Chemistry: Unit 1.5 Electron Arrangement in Atoms

1. As covered briefly in the previous topic, we notice that electrons are arranged in shells around the nucleus. The shells can hold more and more electrons as they get further from the nucleus.

   • the pattern is as follows: 2 (on the shell closet to the nucleus) 8 (on the second shell) up to 18 (on the third shell) and so on.

2. Energy Levels:

   • electrons in different shells have differing amounts of energy that can be represented on an energy level diagram (see picture nearby)
     • we call these shells "main energy levels" and they are labelled 1, 2 and 3.

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