UNIT # 3 Review Objectives Reading 3.1 Structure of the Atom
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3.2 Isotopes 3.3 Arrangement of Electrons
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3.4 Electron Configurations
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3.5 Atomic Mass
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Problems 1 | 2 | 3

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ATOMIC STRUCTURE 3.3 - Arrangement of Electrons

3.3.1 - The Bohr Model of the Atom

Electrons are always moving around the nucleus and so possess potential and also kinetic energy. But they can just possess specific values of power, or certain energy levels. (Crmodify need to be provided to Niels Bohr for proposing this concept.) Click below if you require an illustration of this idea.

According to Bohr"s version of the atom, electrons orlittle bit around the nucleus a lot favor the method planets orlittle bit the sunlight. Different energy levels are associated through the different orbits. The diagram below shows the Bohr version for fluorine. The nucleus of fluorine has 9 protons. Surrounding the nucleus of fluorine is 9 electrons. The electrons arselection themselves in 3 orbits:

In the first orbit, there are 2 electrons. In the second orlittle bit, tbelow are 7 electrons. In the third orbit, tright here are no electron.

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Bohr deduced that:

electrons inside an atom possess various energies electrons in the first orlittle belengthy to the initially power level electrons in the second orlittle bit belengthy to the second power level electrons in the third orbit belong to the 3rd energy level...... etc ...... each energy level of an atom can only accomoday a particular number of electrons. The maximum variety of electrons that can populate a details energy level is provided by the adhering to formula.
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wbelow n = the specific energy level For example: The maximum variety of electron in the initially power level (n = 1) is 2 (1)2 = 2 electrons The maximum variety of electron in the second energy level (n = 2) is 2 (2)2 = 8 electrons The maximum number of electron in the third energy level (n = 3) is 2 (3)2 = 18 electrons .... etc ... See if you deserve to figure out the maximum numbers of electrons in the fourth, fifth, 6th and 7th power level.


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Electrons fill the principal energy levels beginning from n = 1 to n = 7.

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Section 4.6 Arrangement of Electrons in Principal Energy Levels ..p87

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