![]() ![]() However, the model assumed electrons in the shells didn't interact with each other and couldn't explain why electrons seemed to stack in an irregular manner. Conceptual vector illustration of carbon-12 isotope atom, mass number 12 and electron. It also explained why the noble gases were inert and why atoms on the left side of the periodic table attract electrons, while those on the right side lose them. Bohr model representation of the carbon atom, number 6 and symbol C. For example, the shell model explained why atoms got smaller moving across a period (row) of the periodic table, even though they had more protons and electrons. In the Bohr model of the atom, electrons can only exist in clearly defined levels called shells, which have a set size and energy, They orbit around a. The model explained some of the atomic properties of heavier atoms, which had never been reproduced before. (How many electrons are in the outermost. Thus, the Bohr model for heavier atoms described electron shells. Performance Expectation Grade: Middle School (6-8) Lesson Plan and Activity Draw models Have the students use their knowledge of the elements to draw Bohr models. Once the level was full, additional electrons would be bumped up to the next level. Bohr believed each electron orbit could only hold a set number of electrons. More electrons were required to cancel out the positive charge of all of these protons. Heavier atoms contain more protons in the nucleus than the hydrogen atom. ![]()
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