Diagramming Atoms - west-jefferson.k12.oh.us

Diagramming Atoms - west-jefferson.k12.oh.us

Diagramming Atoms Labeling Electrons Part 1 Supplement to Book Glencoe: Chapter 22 and 19-3 Electron shell diagrams Electron shell diagrams are ways to visualize the arrangement of electrons in an atom These diagrams show which energy levels, called shells, the electrons are

found. Electron shell diagrams Particle locations 1. Nucleus - All protons (p+) are found in the nucleus - All neutrons (N) are found in the nucleus

Electron shell diagrams 2. Electron Cloud - All electrons (e-) are found in the electron clouds in orbitals Electron shell diagrams 3. Neutral atoms of any element have equal numbers of protons and electrons 4. The number of neutrons can be found from the atomic mass of an element

- Round atomic mass to the nearest whole number mass number - Mass number = Atomic number + neutron number Energy levels in atoms 1. Electrons are modeled in atoms combining two atomic models - Bohrs model electrons orbit the nucleus in fixed paths - The modern atomic model electrons are found in areas called electron

clouds Energy levels in atoms 2. There are distinct energy levels in an atom n numbern number a. n numbern can equal 1, 2, 3, 4, 5, 6, or 7 b. Only whole, n=1 non-negative numbers n=2

n=3 Energy levels in atoms 3. Energy level numbers generally correspond to period number (there is a pattern to it) Energy levels in atoms 4. Each energy level may contain only a specific maximum number of electrons n#

1 2 3 4 5 6

7 2 8 18 32 32

32 32 Max e- Energy levels in atoms 5. Energy levels fill up in a specific order lowest

energy (n = 1) to highest energy (n = 7)

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