Ap Chemistry Michalek - Unit 7: Atomic Structure And Periodicity Worksheet Page 18
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29AP Chemistry--Michalek
18
Unit 7 Atomic Structure and Periodicity
7.9 Polyelectronic Atoms
Read and outline 7.9
Define:
Polyelectronic Atoms
What are the three energy contributions that must be considered when describing a helium atom?
1.
2.
3.
7.9 Notes
Atoms with more than one electron.
3 energy contributions that must be considered of the Helium atom.
1. the kinetic energy of the electron as they move around the nucleus.
2. the potentials energy of attraction between the nucleus and electrons
3. the potential energy of repulsion between the electrons.
The repulsion of the electrons cause more of an uncertainly in the pathway and they cannot be calculated exactly. This
is called the electron correlation problem.
E
< E
<E
<E
s
p
d
f
7.10 The History of the Period Table
Read 7.10
7.10 Notes
Mendeleev arranged the periodic table by atomic mass
Mosley arranged the periodic table according to atomic number and periodic property
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